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问题 多项选择题

斜孔中心位置度的检测方法主要有（）。

A.用工艺孔检测

B.用标准圆柱检测

C.在坐标镗床上检测

D.用正弦规检测

E.用量棒找正检测

F.用平板直尺检测

答案

参考答案：A, B, C

解答题

有一捆电线一共长100米，剪下24.8米．剩下的比剪下的长多少米？
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单项选择题

Communication via e-mail is by far the most common Internet activity. You can (71 ) with anyone in the world who has an Internet address or e-mail (72) with a system connection to the Internet. All you need is (73) the Internet and an e-mail program. Two of the most widely used e-mail programs are Microsoft’s (74) and Netscape’s Navigator. A typical e-mall message has three basic (75) : header, message, and signature.

（72）处填（）。

A. account

B. No

C. user

D. administrator
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