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【单选题】
将质量为m的质点,以速度v铅直上抛,质点从开始上抛至再回到原处的过程中质点动量的改变量为 ( )A.
质点动量没有改变
B.
质点动量的改变量大小为2mv，方向铅垂向上
C.
质点动量的改变量大小为2mv，方向铅垂向下
D.
质点动量的改变量大小为mv，方向铅垂向下
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皮皮学刷刷变学霸
举一反三
【单选题】—I did my homework quickly and correctly to _______ my teacher's attention. [ ]
A.
pay
B.
catch
C.
give
D.
take
【单选题】My teacher's voice _____sweet,We all like her songs. [ ]
A.
feels
B.
smells
C.
looks
D.
sounds
【单选题】The smile on my teacher's face showed that she was with me. [ ]
A.
sad
B.
pleased
C.
worried
D.
angry
【单选题】I regret ____ my teacher's advice, otherwise I would have succeeded in passing the exam. [ ]
A.
not to take
B.
not taking
C.
not to have taken
D.
having not taken
【单选题】My teacher's voice sweet. We all like her singing. [ ]
A.
feels
B.
smells
C.
looks
D.
sounds
【单选题】I will never forget my teacher's advice: 'As long as you can affect _____ life of your child in an active way, you've been _____ success.' [ ]
A.
/ ; the
B.
a; /
C.
a; the
D.
the; a
【单选题】Thanks to my teacher's valuable help, otherwise I ________ my college entrance exam.
A.
can't pass
B.
hadn't passed
C.
would not have passed
D.
have not passed
【单选题】My teacher's rich knowledge of science ______ my decision ______ study science.
A.
influenced；to
B.
influenced；on
C.
has influenced；with
D.
influences；on
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