2. 外语
  3. Calcium is (essential) for (blood)clotting, for the action of (certain)enzymes, and for the normal contraction and (relax) of mu

Calcium is (essential) for (blood)clotting, for the action of (certain)enzymes, and for the normal contraction and (relax) of mu

admin2005-01-30  99
问题 Calcium is (essential) for (blood)clotting, for the action of (certain)enzymes, and for the normal contraction and (relax) of muscles.
选项 A、essential
B、blood
C、certain
D、relax
答案D
解析
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