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【简答题】
F x = 30+5 t ( SI )的合外力作用在 m = 10 kg 的物体上,此开始 10 s 内的冲量为 N · s
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【单选题】Heart rate of 2-year-old child is
A.
60~70 times per minute
B.
80~90 times per minute
C.
100~ 120 times per minute
D.
130~140 times per minute
E.
150~160 times per minute
【单选题】The 6-year-old child is old enough_______ himself.
A.
to dress
B.
to wear
C.
dresses
D.
wears
【单选题】Under no circumstances ______ be left alone at home.
A.
a three-year-old child should
B.
should a three-year-old child
C.
a three-year-old child should not
D.
should a three-year-old child not
【简答题】Martin is a fif-year-old boy. He used to be a “problem child”, but a recent communication with his mother changed his life. In the past, He didn’t give his mother many problems. , after his father...
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