【简答题】【消耗次数：1】
Direction: Fill in the blank with the correct form of the word given.5. The new ambassador presented his[填空1](credential)to the President yesterday.
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随机题目
【单选题】
关于设计传动轴时的正确概念为：（）。
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要使传动轴最高转速尽可能接近0.7倍临界转速；
②
需要临界转速较高，传动轴实心；
③
要使临界转速较低，传动轴较短；
④
要使传动轴最高转速远远低于临界转速，传动轴较短.
【多选题】
关于主减速器锥齿轮的正确概念为：（）。
①
同等条件，双曲面齿轮较螺旋锥齿轮的尺寸小；
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同等条件，双曲面齿轮较螺旋锥齿轮的尺寸大；
③
同等条件，双曲面齿轮较螺旋锥齿轮的传动比大；
④
同等条件，双曲面齿轮较螺旋锥齿轮的传动比小