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

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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
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_______ contains 75% of all pharmaceutical agents.
A、Semi-synthesis
B、Antibiotics
C、Total synthesis
D、Fermentation