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【判断题】
经济建设是国防建设的基本依托 。( )A.
正确
B.
错误
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皮皮学刷刷变学霸
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【单选题】一力学系统由两个质点组成，它们之间只有引力作用。若两质点受外力的矢量和为零，则此系统：
A.
动量、机械能以及角动量都守恒
B.
动量、机械能守恒，但角动量是否守恒不能断定
C.
动量守恒、但机械能和角动量是否守恒不能断定
D.
动量和角动量守恒，但机械能是否守恒不能断定
【单选题】一力学系统由两个质点组成，它们之间只有引力作用。若两质点所受外力的矢量和为零，则此系统
A.
动量、机械能以及角动量都守恒
B.
动量、机械能守恒，但角动量是否守恒不能断定
C.
动量守恒、但机械能和角动量是否守恒不能断定
D.
动量和角动量守恒、但机械能是否守恒不能断定
【单选题】一力学系统由两个质点组成，它们之间只有引力作用。若两质点所受外力的矢量和为零，则此系统
A.
动量守恒，但机械能和角动量守恒与否不能断定
B.
动量、机械能以及对一轴的角动量都守恒
C.
动量、机械能守恒，但角动量是否守恒不能断定
D.
动量和角动量守恒，但机械能是否守恒不能断定
【多选题】Banked Cloze Directions: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read...
A.
tempting
B.
promising
C.
process
D.
local
E.
comment
F.
proceed
G.
components
H.
charm
I.
appealed
J.
allowing K. display L. weird M. magic N. arrange O. commence Traditional dating is a self-paced, general meeting of two people. The two usually 1)_______ with spending extra time together, getting to know one another and seeing how 2)______ they could be to each other. A good example is a man meeting a woman and sensing her 3)______. He then extends a formal invitation for a date. With traditional dating, you get to go at a steady pace, 4)______ yourself and your date to get to know each other through extensive contact. There are many 5)______ that can be expected from traditional dates. Men, who are supposed to 6)______ these traditional values, will open the door for the woman, stand up when she leaves the table, pay for everything, and 7)______ to the next move. In the 1950s, a man would usually ask a woman out several days ahead for a specific date and time. If she accepted, they would 8)______ for a time to pick her up. He would then take her to a dinner and a movie. Today the rules of traditional dating are less clear. Twenty years ago, if a young lady asked a young man out on a date, it was thought to be 9)______. Now, women are being encouraged to take the initiative and ask men out. A date may consist of a brief meeting at a cafe or a trip to the 10)______ art museum. Men often pay on the first date, but the woman may offer to go Dutch. The traditional dating style has been found much less common now.
【简答题】Unit 1 Vocab IV Homework Find out ten words you learned in unit One in the puzzle and write them down. f a w d o n a t e k u t l i m i t o i l n t i s s u e v j g d e p a r t m e n t f m a p z y x c k...
【单选题】一力学系统由两质点组成,它们之间只有引力作用。若两质点所受外力的矢量和为零,则此系统( )
A.
动量、机械能以及对一轴的角动量都守恒
B.
动量、机械能守恒,但角动量守恒与否不能确定
C.
动量守恒,但机械能和角动量守恒与否不能确定
D.
动量和角动量守恒,但机械能守恒与否不能确定
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