单项选择题

工程中常用的投影图有四种：透视投影图、轴测投影图、水平投影图和标高投影图

A.正确
B.错误

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多项选择题

闭式蜗杆传动的功率损耗一般包括（）等三项。

A．啮合摩擦损耗
B．轴承摩擦损耗
C．溅油损耗
D．散热损耗

单项选择题

The L/C is to be opened before July 10, 2004. The beneficiary’s draft shall be drawn against the L/C ______ by the following documents.

A． companied
B． accompanied
C． companioned
D． accompanying