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提问人：网友valleycwc
发布时间：2022-01-07
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Adhesion bonding can be used at a higher temperature that mechanical joining and thermal bonding.
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更多“Adhesion bonding can be used at a higher temperature that mechanical joining and thermal bonding.”相关的问题
第2题
Any friction fit, tightness or adhesion of the part of any load being lifted should be bro
ken by wedge or tapping and not by increasing the load on the applianceAccording to this sentence, .
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A.the lifting appliance can always lift the freight within its rated load
B.attention should be paid in order not to break the wedge when lifting cargo
C.sometimes the lifting work needs other assistance other than the lifting appliance
D.lifting work should be done with every part fit, tightness or adhesion
第3题
Before adhesion can take place between liquid and solid,it is essential that the liquid su
rface()
点击查看答案
A．provides some mechanical interlocking with the solid
B．exhibits a large contact angle with the solid
C．enters into some form. ofchemieal reaction with the solid
D．exhibits a small contact angle with the solid
第4题
Which statement of elastic modulus is NOT correct？ A) Elastic modulus is also known as Young's
Which statement of elastic modulus is NOT correct？
A) Elastic modulus is also known as Young's modulus
B) The higher the magnitude ofelastic modulus the weaker the interatomic bonding forces
C) Elastic modulus is the constant ofproportionality in Hooke's law
D) Elastic modulus can be measured graphically in the elastic region ofthe stress-strain diagram
第5题
Which statement ofelastic modulus is NOT correct？ A) Elastic modulus is also known as Young's m
Which statement ofelastic modulus is NOT correct？
A) Elastic modulus is also known as Young's modulus
B) The higher the magnitude ofelastic modulus the stiffer the material
C) Elastic modulus can be measured graphically in the elastic region ofthe stress-strain diagram
D) The higher the magnitude of elastic modulus the weaker the interatomic bonding forces
第6题
In covalent bonding, stable electron configuration...
In covalent bonding, stable electron configurations are assumed by the sharing of electrons between adjacent atoms. Two atoms that are covalently bonded will each contribute at least one electron to the bond, and the shared electrons may be considered to belong to both atoms. Covalent bonding is schematically illustrated in Figure 2.10 for a molecule of methane . The carbon atom has four valence electrons, whereas each of the four hydrogen atoms has a single valence electron. Each hydrogen atom can acquire a helium electron configuration (two 1s valence electrons) when the carbon atom shares with it one electron. The carbon now has four additional shared electrons, one from each hydrogen, for a total of eight valence electrons, and the electron structure of neon. The covalent bond is directional; that is, it is between specific atoms and may exist only in the direction between one atom and another that participates in the electron sharing.
第7题
Cancer cells are totally different from normal cells in that:
A．1.？Cancer cells have a reduced dependence on signals from other cells for their survival, growth, and division. 2.？Cancer cells can survive levels of stress and internal derangement that would cause normal cells to kill themselves by apoptosis.
B．3.？Unlike most normal human cells, cancer cells can often proliferate indefinitely.？4. Most cancer cells are genetically unstable,with a greatly increased mutation rate and an abnormal number of chromosomes.
C．5. Cancer cells are abnormally invasive,at least partly because they often lack certain cell adhesion molecules, such as cadherins, that help hold normal cells in their proper plac
E．？6. Cancer cells are abnormally avid for nutrients, which they use to generate much of their ATP by glycolysis in the cell cytosol.
D．7. Cancer cells can survive and proliferate in abnormal locations, whereas most normal cells die when misplace
D．？8. As cancer cells evolve,they secrete signals that influence the behavior of cells in the surrounding connective tissue,thereby modifying the tumor’s microenvironment.
第8题
One variety of partially biodegradable plastic beverage container is manufactured from sma
ll bits of plastic bound together by a degradable bonding agent such as cornstarch. Since only the bonding agent degrades, leaving the small bits of plastic, no less plastic refuse per container is produced when such containers are discarded than when comparable nonbiodegradable containers are discarded. Which of the following, if true, most strengthens the argument above？
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A．Both partially biodegradable and nonbiodegradable plastic beverage containers can be crushed completely flat by refuse compactors.
B．The partially biodegradable plastic beverage containers are made with more plastic than comparable nonbiodegradable ones in order to compensate for the weakening effect of the bounding agents.
C．Many consumers are ecology-minded and prefer to buy a product sold in the partially biodegradable plastic beverage containers rather than in nonbiodegradable containers, even if the price is higher.
D．The manufacturing process for the partially biodegradable plastic beverage containers results in less plastic waste than the manufacturing process for nonbiodegradable plastic beverage containers.
E．Technologica" problems with recycling currently prevent the reuse as food or beverage containers of the plastic from either type of plastic beverage container.
