题目内容

螺纹的牙型角为α,螺纹中的摩擦角为ρ,当量摩擦角为ρV,螺纹升角为λ,则螺纹的自锁条件为( )。

A. λ小于等于α
B. λ大于α
C. λ小于等于ρV
D. λ大于ρV

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预紧力为QP的单个紧螺栓联接,受到轴向工作载荷F作用后,螺栓受到的总拉力Q( )QP+

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Complete the following sentences with the expressions given below. Change the form if necessary.1 ___________, he got an A in every exam.2 The girl kept crying _.3 A new point of view about how to prevent earthquakes is now.4 The tickets for the show in 30 minutes.5 I don’t like to go out during the ____.

Choose the correct Chinese translations for the following sentences from the passage.His mother hurried him up but the child stopped to look at the violinist.

A. 他的母亲催促他前行，但是这个孩子停下来看着小提琴家。
B. 他的母亲和他匆忙前行，这个孩子不再看小提琴家了。

Choose the correct Chinese translations for the following sentences from the passage.If we do not have a moment to stop and listen to one of the best musicians in the world playing some of the best music ever written, how many other beautiful things are we missing?

A. 假如我们连停下来倾听世界顶级音乐家演奏最美妙乐曲的空闲也没有，我们又会错过多少美好的事物呢？
B. 假如我们连停下来倾听世界顶级音乐家演奏最美妙乐曲的空闲也没有，我们又会怀念多少美好的事物呢？