题目内容

有机磷中毒的机制是可使

A. 巯基酶失活
B. 细胞色素氧化酶失活
C. 胆碱酯酶失活
D. 二氢叶酸还原酶失活
E. 环化酶失活

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More than one example ______ necessary to make the students understand this rule clearly.

A. should be
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A. given names
B. full names
C. family names
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The trouble with such resources as coal,oil and gas ______ that they are not renewable.

A. has been
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维生素C注射剂的正常情况下的颜色和性状是

A. 无色澄明液体
B. 红色浑浊液体
C. 棕色澄明液体
D. 黄色澄明液体
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