题目内容

设三矢量a,b,c满足关系式ab=ac,则必有

A. a=0或b=c
B. a=b-c=0
C. 当a≠0时,有b=c
D. a⊥(b-c)

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建设项目投资含()投资两部分。

A. 无形资产和有形资产
B. 新增资产和无形资产
C. 固定资产和流动资产
D. 无形资产和其他资产

_6_ often it was destroyed by fire or in a war

A. still
B. but
C. even
D. or

They have learned about it from _13_ people

A. older
B. the oldest
C. outside
D. most

Mr. Jones thought that he must have _5_

A. left
B. gone
C. taken
D. arrived

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