题目内容
（请给出正确答案）
[主观题]
You should avoid wearing anything that will detract audience when delivering a speech.
提问人：网友zhihengshan
发布时间：2022-01-07
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A. increase engine speed to insure adequate flow of oil to all parts of the engine
B. pay no attention unless there are unusual noises from the engine
C. check operating pressures and temperatures，and check for leaks
D. run the engine at idle until the temperature has increased
