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【单选题】
导致酸碱指示剂发生颜色变化的外因条件是A.
溶液的温度
B.
溶液的粘度
C.
溶液的电离度
D.
溶液的酸碱度
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【单选题】________ children whose parents had died in the earthquake ________ sent to other families. [ ]
A.
A great number of; was
B.
A large number of; were
C.
The great number of; was
D.
The great number of; were
【简答题】Please complete the sentences with the given words. A. previous B. inspire C. neglect D. demonstrated E. guard F. substitute G. remarkable H. abuse I. refuge J. ...
【简答题】按照货物移动的方向划分,国际贸易可以分为哪些种?
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