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【单选题】
听广播A.
hear broadcast
B.
listen to the radio
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皮皮学刷刷变学霸
举一反三
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【简答题】头颈部的动脉主干是____,上肢的动脉主干是____,胸部的动脉主干是____,腹部的动脉主干是____,盆部的动脉主干是____,下肢的动脉主干是____。
【单选题】如下图所示,在光滑的水平面上,质量分别为m1和m2的木块A和B之间用轻弹簧相连,在拉力F作用下,以加速度a做匀加速直线运动,某时刻突然撤去拉力F,此瞬时A和B的加速度为a1和a2,则( )
A.
a1=a2=0
B.
a1=a,a2=0
C.
a1=m1m1+m2a,a2=m2m1+m2a
D.
a1=a,a2=-m1m2a
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