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问题 多项选择题

对进入高原铁路的铁路货车，要根据高原铁路的特殊性，提高（）的检查、修理标准，按照标准进行记名式整备。

A.轮轴

B.闸瓦

C.空气制动

D.车钩缓冲装置

答案

参考答案：A, B, C, D

单项选择题

The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether.

A hotdog vendor sold $45 worth of hotdogs at lunchtime Tuesday. Each hotdog cost $1.50. What percentage of his day’s stock of hotdogs did the vendor sell at lunchtime ？（）
(1) The vendor started the day with 120 hotdogs.
(2) The vendor sold twice as many hotdogs at dinnertime as he sold at lunchtime.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.
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单项选择题

在车床上用两顶尖装夹车削光轴，加工后检验发现中间小，两头大误差，其最大可能的原因是（）。

A.前后两顶尖刚度不足

B.刀架刚度不足

C.工件刚度不足
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