题目内容
（请给出正确答案）
A.Poly(lactic acid-glycolic acid)
B.Poly (glycolic acid)
C.Poly(anhydrides)
D.Poly(ortho esters)
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更多“Surface eroding polymers includes？ ________.”相关的问题
A.Poly (glycolic acid)
B.Poly (L-lactic acid)
C.Poly (lactic acid-glycolic acid)
D.Poly(anhydrides)
A.Poly (glycolic acid)
B.Poly (L-lactic acid)
C.Poly (lactic acid-glycolic acid)
D.Poly(anhydrides)
Directions：Remove cap.Spray it on the surface ofthe object and wipe with clean paper towel or dry cloth.
Caution：In case of eye contact,clean your eyes with water.If swallowed,drink plenty of water and consult physician immediately.
Scientist 1
A deep ocean of liquid water exists on Europa. Jupiter&39;s gravitational field produces tides within Europa that can cause heating of the subsurface to a point where liquid water can exist. The numerous cracks and dark bands in the surface ice closely resemble the appearance of thawing ice covering the polar oceans on Earth. Only a substantial amount of circulating liquid water can crack and rotate such large slabs of ice. The few meteorite craters that exist are shallow and have been smoothed by liquid water that oozed up into the crater from the subsurface and then quickly froze.
Jupiter&39;s magnetic field, sweeping past Europa, would interact with the salty, deep ocean and produce a second magnetic field around Europa. The spacecraft has found evidence of this second magnetic field.
Scientist 2
No deep, liquid water ocean exists on Europa. The heat generated by gravitational tides is quickly lost to space because of Europa&39;s small size, as shown by its very low surface temperature (–160°C). Many of the features on Europa&39;s surface resemble features created by flowing glaciers on Earth. Large amounts of liquid water are not required for the creation of these features. If a thin layer of ice below the surface is much warmer than the surface ice, it may be able to flow and cause cracking and movement of the surface ice. Few meteorite craters are observed because of Europa&39;s very thin atmosphere; surface ice continually sublimes (changes from solid to gas) into this atmosphere, quickly eroding and removing any craters that may have formed.
1.Which of the following best describes how the 2 scientists explain how craters are removed from Europa&39;s surface？
A.Sublimation;Filled in by water
B.Filled in by water;Sublimation
C.Worn smooth by wind;Sublimation
D.Worn smooth by wind;Filled in by water
Sedimentary rocks are composed largely of minute fragments derived from the disintegration of existing rocks and in some instances from the remains of animals. As sediments are transported, individual fragments are assorted according to size. Distinct layers of such sediments as gravels, sand, and clay build up, as they are deposited by water and occasionally wind. These sediments vary in size with the material and the power of the eroding agent. Sedimentary materials are laid clown in layers called strata.
When sediments harden into sedimentary rocks, the names applied to them change to indicate the change in physical state. Thus, small stones and gravel cemented together are known as conglomerates; cemented sand becomes sandstone; and hardened clay becomes shale. In addition to these, other sedimentary rocks such as limestone frequently result from the deposition of dissolved material. The ingredient parts are normally precipitated by organic substances, such as shells of clams or hard skeletons of other marine life.
Both igneous and sedimentary rocks may be changed by pressure, heat, solution, or cementing action. When individual grains from existing rocks tend to deform. and interlock, they are called metamorphic rocks. For example, granite, an igneous rock, may be metamorphosed into a gneiss or a schist. Limestone, a sedimentary rock, when subjected to heat and pressure may become marble, a metamorphic rock. Shale under pressure becomes slate.
Which one of the following is a metamorphic rock？
A．Granite.
B．Shale.
C．Slate.
D．Limestone.
A、disorientating the local culture of the colonized
B、eroding the local languages of the culture
C、reinventing the past in the name of tradition
D、adopting anything from Western countries
According to the passage, the floor of the Black Sea can best be compared to a
A．rapidly moving conveyor belt.
B．slowly settling foundation.
C．rapidly expanding balloon.
D．violently erupting volcano.
E．slowly eroding mountain.
A．Young people, especially boys can't easily get access to good books of non-fiction.
B．A lot of good non-fiction books are coming out into the market.
C．Such kind of non-fiction are eroding into the reading habits of young people especially boys.
D．Non-fiction books have been isolated from our reading experience.
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