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【多选题】
不能与三氯化铁显色的药物是A.
雌二醇
B.
炔雌醇
C.
炔诺酮
D.
己烯雌酚
E.
氢化可的松
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反馈参考答案：
举一反三
【单选题】Since the introduction of the new technique, the production cost______greatly.
A.
reduces
B.
has been reduced
C.
is reducing
D.
is reduced
【单选题】Since the introduction of the new technique, the production cost ______ greatly.
A.
reduces
B.
is reduced
C.
is reducing
D.
has been reduced
【简答题】Since the introduction of the new technique, the (produce) ______ cost has been reduced greatly.
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