题目内容

（） mechanical device has ever been invented that can satisfactorily replace teasel flower heads for raising the nap on cloth.

A. No
B. Not the
C. Never has a
D. There is no

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The vocabulary and grammatical differences between British and American English are so trivial and few as hardly （）.

A. noticed
B. to be noticed
C. being noticed
D. to notice

Lowbrows are quite （） for highbrows to have symphonies and their Russian novels.

A. skeptical
B. contained
C. stunning
D. yearning

热极津枯重证之人，可见

A. 干荔舌
B. 赭黑舌
C. 火柿舌
D. 雪花舌

离心泵基本特性曲线中最主要的是（）曲线。Q——流量；H——扬程；P——功率；η——效率；Δh——允许汽蚀余量。

A. Q—H
B. Q—P
C. Q—η
D. Q—Δh