均质细直杆OA长为ι，质量为m，A端固结一质量为m的小球（不计尺_爱下问搜题

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问题单项选择题

均质细直杆OA长为ι，质量为m，A端固结一质量为m的小球（不计尺寸），如图4-76所示。当OA杆以匀角速度ω绕O轴转动时，该系统对O轴的动量矩为（）。

A.

B.

C.mι2ω

D.

答案

参考答案：D

完形填空

Life is filled with challenges. As we get older we 26 realize that those challenges are the very things that 27 us and make us who we are, it is the same with the challenges that come with 28 .
When we are faced with a challenge, we usually have two 29 : we can try to 30 it off, or we can decide that the thing presenting the challenge isn’t worth the 31 and call it quits. Although there are 32 times when calling it quits is the right thing to do, in most 33 all that is needed is commitment and 34 .
When we are devoted to 35 , it means that no matter how 36 or how uncomfortable something is, we will always choose to 37 it instead of running away from it. Communication is making a 38 for discussion and talking about how you feel instead of just saying what the other person did wrong. 39 you can say to a friend, “I got my feelings hurt.” 40 “You hurt my feelings,” you are going to be able to

solve the problem much faster.
In dealing with many challenges that friendship will bring to you, try to see them for 41 they are: small hurdles（障碍） you need to jump or 42 on your way through life. Nothing is so big that it is impossible to get over, and hurt only 43 to make us stronger. It’s all part of growing up, it happens to everyone, and some day you will 44 on all of this and say, “ 45 as it was, it made me who I a

m today. And that is a good thing

A．opportunities

B．expectations

C．consequently

A．communication

D．consideration

B．rather than

B．come across

C．get through

A．Interesting

C．Complicated

判断题

油浆中固体含量要求不大于6克/升