题目内容

All fights ______ because of the terrible weather, they had to go there by train.

A. having been canceled
B. had been canceled
C. having canceled
D. were canceled

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with the development in science and technilogy man can make various flowers _____ before their time.

A. to bloomed
B. bloom
C. bloomed
D. blooming

The project _____ by the end of 2021 , will expend the city’s telephone network to cover 1000000 users.

A. accomplished
B. being accomplished
C. to be accomplised
D. having been accomplished

根据工艺等价原则，过盈配合中，若孔的公差等级≤_，则轴的公差等级应比孔的_1级。

A. IT7，高
B. IT7，低
C. IT8，高
D. IT8，低

下列配合代号错误的有_____。

A. H10/c10
B. H7/k7
C. h7/K6
D. H7/f8