题目内容

Section DSpot dictation. Listen to the following short passage, then fill in the blanks with the missing words or phrases. The passage will be read three times.Good evening, ladies and gentlemen!First of all, I’d like to (20) __________ a sincere welcome to you all, the new comers of our company. As you know, our company is one of the top 50 companies in the country and has a history of more than 100 years. I think you must (21) _________ being a member of such a great company. But we cannot (22) __________ tradition alone. We need new employees with new knowledge and creative (23) _____________.I would like to welcome you (24) ____________, and from today, let’s begin to work together.

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该凸轮廓线的设计方法采用。

该凸轮推程属于运动规律,速度为常值,为零,但在推程开始和结束两个时刻为无穷大∞,会产生冲击,适用于低速轻载场合。

回程是从动件由最高位置回落到最低位置的过程,该凸轮回程属于运动规律,其两端会产生冲击。

指令周期是指

A. 从主存中读取一条指令的时间
B. 从主存中读取一条指令到执行结束的时间
C. 执行一条指令的时间
D. 主频脉冲周期

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