Calcium is (essential) for (blood)clotting, for the action of (certain)enzymes,

游客2024-01-05 6

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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