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【单选题】
图a所示机构中，O1A¤¤O2B，且O1A=O2B=10cm，曲柄O1A以匀角速度w=Ö2rad/s绕O1轴朝逆时针向转动，O1、O2位于同一水平线上。图b所示CD杆的C端沿水平面向右滑动，其速度大小vC=20cm/s，D端沿铅直墙滑动。图c所示EF杆在倾角为45°的导槽内滑动，契块以匀速u=20cm/s沿水平面向左移动。设AB、CD、EF三均质杆的重量相等，在图示位置时，它们的动量矢量分别用KAB、KCD、KEF表示，则下列说法正确的是【图片】A.
K AB = K CD ¹ K EF
B.
K AB = K EF ¹ K CD
C.
K AB ¹ K CD ¹ K EF
D.
K AB = K CD= K EF
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举一反三
【多选题】Which of the following are included in the general rules of self-editing?
A.
Read your paper aloud when you are in the process of editing.
B.
When working on a timed essay, budget 10-15% of your time for editing.
C.
To help you see each word, read your paper backward while editing.
D.
To be as fresh as possible, edit your paper immediately after you finish writing it.
【单选题】In the editing stage of a writing lesson, ________.
A.
students mainly check their ideas and logical development
B.
B there are three forms: teacher editing, peer editing and self-editing
C.
C students can negotiate meaning and improve writing
D.
D teachers shouldn’t give any guidance
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