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【单选题】
如图所示直角 OBC 绕轴 O 转动 , 使套在其上的小环 M 沿固定直杆 OA 滑动。已知 :OB= 0.1 m ,OB 与 BC 垂直 , 的角速度ω =0. 5 rad/s , 角加速度为零。求当 φ =60 °时 , 小环 M 的速度和加速度。A.
v M =0.34 m/s ， a M =0.35m/s 2
B.
v M =0.17m/s ， a M =0.70m/s 2
C.
v M =0.34m/s ， a M =0.7m/s 2
D.
v M =0.17m/s ， a M =0.35m/s 2
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a luxury car brand that beats all its rivals
B.
a car-maker that aims at high-end customers
C.
a battery-maker that has become mainstream
D.
an electric car brand that also produces battery
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支付给职工以及为职工支付的现金
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支付给其他与经营活动有关的现金
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It was founded by tailors.
B.
It is a family business with a long history.
C.
It has been on business for 15 years.
D.
It manufactures boots for men and women.
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