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【单选题】
主管部门对阿维菌素单制剂产品的最低含量规定为A.
0.5%
B.
0.2%
C.
0.1%
D.
0.4%
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皮皮学刷刷变学霸
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【单选题】Criticism and self-criticism are necessary ______ they help us to find and correct our mistakes.
A.
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B.
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on that
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