单项选择题

一般参数的闭式软齿面齿轮传动的主要失效形式是___。 A.
齿面点蚀 B.
轮齿折断 C.
齿面磨粒磨损 D.
齿面胶合

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多项选择题

Which of the following statements about thin films used in microelectronic devices is correct?
A、Films of the same material deposited by different deposition methods may have different properties.
B、Most thin film layers used in ICs are fabricated by deposition.
C、If chemical reactions are involved when a film is deposited on a substrate surface from a vapor phase, such a process is called chemical vapor deposition.
D、All vapor deposition processes operate at atmospheric pressure.

单项选择题

葡萄酒变酸的原因是______。
A、醋酸菌发酵产生醋酸
B、乳酸菌发酵产生醋酸
C、醋酸菌发酵产生乳酸
D、乳酸菌发酵产生乳酸
E、醋酸菌发酵产生丁酸