题目内容

公差总是大于零的正数。

A. 对
B. 错

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图形上未注出公差的尺寸,可以认为是没有公差的尺寸。

A. 对
B. 错

Icebergs are parts of glaciers that break off, ________ into water, foat about awhile, and finally melt.

A. mobile
B. drift
C. shift
D. rotate

Streams of fire ran down the hills, and at length a _________ arose so loftily that it touched the skies.

A. fire
B. spark
C. glow
D. blaze

In the Persian Gulf area, oil is found in ______and its production has been able to keep up with world demand.

A. elaboration
B. abundance
C. elegance
D. efficiency

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