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【多选题】
35年前，安徽小岗村18位农民冒着风险按下红手印，将村集体土地“分田到户”：35年后，小岗村将分散的土地重新集中后对外发包，流转总面积占可耕地面积的44％。前者是为了温饱，后者是为了进一步致富。小岗村的变化告诉我们( )。A.
发展具有曲折性．任何事物的发展都是循环往复的
B.
同一事物在发展的不同过程和不同阶段有不同的矛盾
C.
不同的矛盾构成了一事物区别于他事物的特殊本质
D.
辩证的否定既肯定又否定．既克服又保留
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【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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