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问题 单项选择题

螺栓“M30100”的标注中，“30”的含义是：（）。

A.螺纹公称直径是30mm

B.螺栓长度是30mm

C.粗牙普通螺纹

D.螺纹公称直径是30cm

答案

参考答案：A

改错题

短文改错（共10小题；每小题1分，满分10分）

Dear Tom,

Last year I take a part-time job in the international camp for children. I have been telling one more worker will be needed this year and I think you are fit it. Why not to join us? The camp is at the foot of a small hill close to a river. It is so beautiful place! We can hear birds singing happy all around. Everybody sleep in tents,  that is very exciting. We usually work only five hours a day, so we will have plenty of spare time to visit the area and have funs. I am sure it will be an unforgettable experience. If you are interesting, reply to me soon.

Yours,

Jack
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选择题

一个唐朝商人从长安出发，沿着丝绸之路的陆路通道行走，途中可以与他进行商品贸易的国家或地区有  [ ]

A．西域、大食、波斯

B．大食、波斯、新罗

C．西域、日本、大食

D．波斯、新罗、日本
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