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【单选题】
下列关于质点运动的说法,正确的是 [ ]A.
加速度恒定不变时，物体的运动方向也不变
B.
平均速率等于平均速度的大小
C.
当物体的速度为零时，加速度必定为零
D.
质点作曲线运动时，质点速度大小的变化产生切向加速度，速度方向的变化产生法向加速度
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举一反三
【简答题】操作面板的功能键中,标有( )的键用于显示报警信息。A. DGNOS B. ALARMC.PARAMD.SYSTEM
【单选题】When assembling, we should treat them carefully.安装的时候，我们应该仔细对待它们。 01010200
A.
They should be assembled carefully.
B.
They should be measured carefully.
C.
They should be adjusted carefully.
D.
They should be assembled carelessly.
【单选题】— Can you tell me the way to the post office? — I am going there too. You can _______ me.
A.
follow
B.
stop
C.
order
【简答题】This was my grandmother’s first Christmas without grandfather. When we reached her house, it did seem a little 36 without grandfather. Grandfather had always said the Christmas 37 was the most importa...
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