双向运动的丝杠螺母应用（）螺母来消除双向轴向间隙。A.一个 B._爱下问搜题

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问题单项选择题

双向运动的丝杠螺母应用（）螺母来消除双向轴向间隙。

A.一个

B.两个

C.四个

D.六个

答案

参考答案：B

填空题

养生的总则是（）、（）。

完形填空

I arrived in the classroom，ready to share my knowledge and experience with 75 students who would be my English literature class．Having taught in the US for 17 years，I had no      about my ability to hold their attention and to  on them my admiration for the literature of my mother tongue．
I was shocked when the monitor shouted，“    !” The entire class rose as I entered the room，and I was somewhat      about how to get them to sit down again，but once that awkwardness (尴尬) was over，I quickly      calmness and began what I thought was a fact—packed lecture，sure to gain their respect—perhaps    their admiration．I went back to my office with the rosy glow which came from a(n)      of achievement．
My students    diaries．However，as I read them，the happy mood was gradually    by a strong sense of sadness．The first diary said, “Our literature teacher didn’t teach us anything today．    her next lecture will be better．”Greatly surprised，I read diary after diary，each expressing a     theme．“Didn’t I teach them anything? I described the entire philosophical framework (哲学体系) of Western thought and laid the historical    for all the works we’ll study in class，” I complained．“How    they say I didn’t teach them anything?”
It was a long term，and it      became clear that my ideas about education were not the same as    of my students．I thought a teacher’s job was to raise    questions and provide enough background so that students could ＿  their own conclusions．My students thought a teacher’s job was to provide      information as directly and clearly as possible．What a difference!
  ，I also learnt a lot，and my experience with my Chinese students has made me a＿  American teacher, knowing how to teach in a different culture.

C．Fortunately

C．development

A．immediately

B．interesting