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【单选题】
Mother was worried because little Tom was ill, especially _____ his father HHhhwas away in Canada. [ ]A.
as
B.
that
C.
during
D.
if
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举一反三
【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】Which statement about hydrogen bonds is NOT true?
A.
Hydrogen bonds are highly directional.
B.
Hydrogen bonds are capable of holding molecules in a specific geometric arrangement.
C.
Hydrogen bonds are strongest when the three atoms in the bond are in a straight line.
D.
Hydrogen bonds are strongest when the oxygen atom is perpendicular to the hydrogen donor.
E.
Hydrogen bonds place a hydrogen ion directly between two partial negative charges.
【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.
【单选题】疥疮的临床表现是
A.
好发于皮肤皱褶部位
B.
自觉奇痒，遇热及夜间更甚
C.
皮损初起为针头大小的丘疹或水疱
D.
可见一灰白色、浅黑色或普通皮色的细浅纹，稍弯微隆起，长约0.5cm
E.
以上都是
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