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【单选题】

138 规定齿轮的分度圆用________绘制。

A.
双点画线
B.
粗实线
C.
点画线
D.
细实线
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题目标签:分度圆齿轮绘制
参考答案:
参考解析:
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举一反三

【单选题】Passage 3 Questions 11 to 15 are based on the following passage: Scientists in India have invented a new way to produce electricity. Their invention does not get its power from oil, coal or other fuel...

A.
Because bullocks have long been used by Indian people
B.
Because bullocks walk slowly and are easy to control.
C.
Because there are few non-working bullocks in India
D.
Because there is not enough oil in India.