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提问人：网友anonymity 发布时间：2022-01-07

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Choose the correct statement about the "wetting" phenomenon. A．A fiber can be properly we

Choose the correct statement about the "wetting" phenomenon.

A．A fiber can be properly wetted by a matrix only when the surface energy of matrix is greater than that of the fiber

B．A fiber can be properly wetted by a matrix only when the surface energy of matrix is lower that that of the fiber

C．A fiber can be properly wetted by a matrix only when the surface energy of matrix is equal to that of the fiber

D．It is nothing to do with surface energies of matrix and fiber

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更多“Choose the correct statement about the "wetting" phenomenon. A．A fiber can be properly we”相关的问题

第1题

Consider the following figure. Suppose the world price of steel is given and constant at $200 per ton and the Mexican government provides a subsidy of $200 per ton to its steel producers, as indicated by the supply schedule SM (with subsidy).

As a result of the subsidy, the welfare loss to Mexico due to inefficient domestic production equals: ___________.

A、$200

B、$400

C、$600

D、$800

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第2题

Express the following limit as definite integral

A、

B、

C、

D、

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第3题

The chemical bond that keeps stability of primary structure of protein is

A、disulfide bond

B、hydrophobic effect

C、peptide bond

D、hydrogen bond

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第4题

The correct descriptions about the primary structure of protein are

A、Primary structure is the basis of spatial conformation of protein.

B、Proteins with similar primary structure have similar spatial structure and functions.

C、Primary structure provides information about biological evolution.

D、Changes in primary structure can cause diseases.

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第5题

About peptide unit, the correct statements include

A、The basic unit that constitutes secondary structure of polypeptide chain.

B、The two α carbons are in the cis configuration.

C、The single bond to the α carbon can rotate freely.

D、The relative positions of the two adjacent peptide units are independent of rotation of the single bonds on either side of the α carbon.

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第6题

Which of the following descriptions about the α-helix is(are) incorrect

A、It is one of the main forms of secondary structure of proteins.

B、The side chains amino acids extend to the outside of the helix

C、The main factor in stabilizing the helix is peptide bond.

D、All 20 amino acids can participate in the formation of α-helix structure.

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第7题

Which of the following statements about the motif are correct

A、It is a structural component with specific spatial structure and function.

B、It usually has characteristic amino acid sequences.

C、Supersecondary structure with special function is motif.

D、Motifs in some proteins consist of only a few amino acid residues.

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第8题

A functional protein must have

A、primary structure

B、β-pleated sheet

C、tertiary structure

D、quaternary structure

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第9题

The correct descriptions about hemoglobin(Hb) are

A、Oxygen dissociation curve is a rectangular hyperbola (a simple hyperbolic curve).

B、The four subunits have the same equilibrium constant with O2.

C、Binding with O2 has a positive cooperativity.

D、The conformation is in T state without O2.

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