问答题

The maximum allowable deflection of a shaft____determined by critical speed, gear, or bearing A. often B. must )C. was D. is usually

【参考答案】

答案：D

解析：本题考查的是对机械工程术语的理解和使用。选项D "is usually......

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The maximum allowable deflection of a shaft­____determined by critical speed, gear, or bearing A. often B. must )C. was D. is usually