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【单选题】
枸橼酸钠抗凝的机制是( )A.
与血浆中的 Ca 2 ＋ 结合形成可溶性络合物
B.
去掉血浆中的纤维蛋白原
C.
破坏血浆中的凝血酶原激活物
D.
与血浆中的 Ca 2 ＋ 结合而沉淀
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举一反三
【单选题】There are ten on the list , so you are _______.
A.
an eleventh
B.
the eleventh
C.
an eleven
D.
eleven
【单选题】There are ten children here, so the cake must be divided _____ ten pieces.
A.
into
B.
in
C.
between
D.
from
【单选题】There are ten stories in this book,______are the most interesting ones.
A.
the first four of them
B.
the first four of those
C.
the first four
D.
the first four of which
【单选题】According to the writer, why 'in our over-sixty population there are ten widows for every man' ?
A.
Men work harder than women.
B.
The writer doesn't explain it clearly in the passage.
C.
Men and women are not equal.
D.
Men don't like to exercise.
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