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【单选题】
相间的双色线,按电气规范只能用作A.
火线
B.
零线
C.
地线
D.
网格线
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举一反三
【单选题】Silk‘s strength comes from its weak hydrogen bonds working together. 查看材料
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】A number of different types of bonds maintain the structure of proteins. These include disulphide, hydrogen and ionic bonds, as well as hydrophobic interactions. Some of these are stronger than others...
A.
disulphide bonds
B.
hydrogen bonds
C.
hydrophobic interactions
D.
ionic bonds
【单选题】疥疮的临床表现为
A.
病因不明确，以风团损害为主。
B.
病因明确可见隧道，丘疹，结节。
C.
病因不明确，多形态损害。
D.
病因明确，可见红斑、肿胀 水疱某一时期以一种皮损为主。
【单选题】Which of the following statements about hydrogen bonds in water is wrong?
A.
The nearly tetrahedral arrangement of the orbitals about the oxygen atom allows each water molecule to form hydrogen bonds with as many as four neighboring water molecules.
B.
In liquid water at room temperature and atmospheric pressure, however, water molecules are disorganized and in continuous motion, so that each molecule forms hydrogen bonds with an average of only 3.8 other molecules.
C.
In ice, on the other hand, each water molecule is fixed in space and forms hydrogen bonds with a full complement of four other water molecules to yield a regular lattice structure.
D.
Hydrogen bonds account for the relatively high melting point of water, because much thermal energy is required to break a sufficient proportion of hydrogen bonds to destabilize the crystal lattice of ice.
【简答题】简述疥疮的临床表现。
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