试题与答案

中速暖机和额定转速下暖机的目的是防止材料脆性破坏和避免过大的热应力。

题型:判断题

题目:

中速暖机和额定转速下暖机的目的是防止材料脆性破坏和避免过大的热应力。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B

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题型:单项选择题

The participants in a race consisted of 3 teams with 3 runners on each team. A team was awarded 6-n points if one of its runners finished in nth place, where 1≤n≤5. If all of the runners finshed the race and if there were no ties, was each team awarded at least one point ?()
(1)No team was awarded more than a total of 6 points.
(2)No pair of teammates finished in consecutive places among the top five places.

A.条件(1)充分,但条件(2)不充分.

B.条件(2)充分,但条件(1)不充分.

C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.

D.条件(1)充分,条件(2)也充分.

E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.

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