BB0041mm等于()μm。
A.10
B.100
C.1000
D.10000
参考答案:C
如图所示,半径为R的圆盘绕垂直于盘面的中心轴匀速转动,其正上方h处沿OB方向水平抛出一小球,要使球与盘只碰一次,且落点为B,
求(1)小球的初速度v0
(2)圆盘转动的角速度ω.
Dad was________whisky,but normally only drank in the evening when work was done.[ ]
A.tired of
B.fond of
C.familiar with
D.afraid of