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【单选题】
S1:Chief officer,have you been to Long Beach before?S2:Yes, but that was three years ago. Now, so much has been changed here.Do you?S1:It's the first time I am going abroad.Shall we go to buy a map of the city?S2:It sounds good. But we do not know where to buy.S1:How about asking someone the way to Long Beach?S2:That is a good idea.There is a shop,let's go there and buy a map and find someone to ask the way to the city.Q2:What conclusion can you make from the conversation?
A.
In the end, they got to the city.
B.
They found someone to ask the way and bought a map.
C.
They found a shop, and they took a chance to get information and buy a map.
D.
They are familiar with the city.
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皮皮学刷刷变学霸
举一反三
【判断题】由于带的弹性变形而产生的带与带轮间的滑动称为弹性滑动
A.
正确
B.
错误
【简答题】果蝇杂交实验过程中,第一步要首先()杂交亲本蝇,然后在()小时内挑选雌雄()蝇并配对杂交,其中尾部体节融合的是()蝇,有6个体节的是()蝇。
【简答题】免疫沉淀反应是 与抗体特异性结合,在适当条件下出现沉淀现象。
【简答题】( )称为弹性滑动.
【单选题】免疫沉淀反应是 [填空(1)] 与 [填空(2)] 特异性结合,在适当条件下出现沉淀物的现象。
A.
可溶性抗原
B.
相应抗体
【单选题】由于带的( )引起的带与带轮之间的微量滑动,称为带传动的弹性滑动
A.
弹性变形
B.
打滑
C.
疲劳破坏
D.
过载
【判断题】弹性滑动 ——因材料的弹性变形而引起带与带轮表面产生的相对滑动现象称为弹性滑动。带传动的弹性滑动是不可避免的。
A.
正确
B.
错误
【简答题】称为带的弹性滑动。是 避免的。 称为打滑,打滑总从 带轮开始,打滑是 避免的,打滑就是失效了。
【判断题】主动轮的线速度大于带的线速度,带的线速度大于从动轮的线速度,这种现象称为弹性滑动。 ( )
A.
正确
B.
错误
【判断题】在带传动中,由于带的弹性和拉力差而引起的滑动称为弹性滑动,又称为打滑。
A.
正确
B.
错误
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