带传动装置的防护罩可采用金属骨架的防护网，与带的距离不应小于_爱下问搜题

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问题单项选择题

带传动装置的防护罩可采用金属骨架的防护网，与带的距离不应小于( )mm。

A．20
B．30
C．40
D．50

答案

参考答案：D

完形填空

When I began teaching in a university, I was invited to a workshop for new professors. I had ____ a long time learning what to teach, but not learning how to ____ it. Somehow, my university seemed to hope a weekend spent with experienced professors would ____ for that. My colleagues presented wellcrafted lectures about the tools they used. I enjoyed their ___， but do not remember a thing they said.
At a coffee break during the lectures, finding myself ____， I turned to a mathematics professor standing nearby. I asked him what his favorite teaching ____ was. “A cup of coffee，” he said, “I talk too much and too fast in the classroom. Students sometimes have trouble ____ me. So when I've said____ that I want my students to think about, I would____ and take a sip of coffee. It lets what I've just said sink in.”
When we were called to the next talk, he put down his cup and I ____ there was not a trace of coffee in it. “My doctor ____ me to stop drinking coffee，” he explained. “So I have always used a(n)____ cup.” I decided to try his ____ in my class.
I took a cup of coffee with me to my next class. It helped. My pauses, as I ____ the coffee, not only gave my students ____ to think about what I had said, but gave me time to think about what I was going to say next. I began to use my ____ to look around the room to see how my students were reacting to what I had just said. When I saw their ____ wander, I tried to bring them back. When I saw them puzzled over some concept that I thought I had ____， I gave another example. My ____ became less organized and less brilliant, but my students seemed to ____ me better.

A．experiences

C．presentations

判断题

社会主义初级阶段是任何国家进入社会主义都必须经历的。