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【单选题】
汽车后备箱盖一般都有可伸缩的液压杆,如图甲所示,图乙为简易侧视示意图,液压杆上端固定于后盖上 A 点,下端固定于箱内 O ′ 点, B 也为后盖上一点,后盖可绕过 O 点的固定铰链转动,在合上后备箱的过程中
A.
点相对于 O′ 点做圆周运动
B.
点相对于 O′ 点做圆周运动
C.
A 与 B 相对于 O 点线速度大小相同
D.
A 与 B 相对于 O 点角速度大小相同
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-mo-distant future when all autos will be abandoned and allowed to rust. Other authorities, how...
A.
keep in the right lane
B.
wait to arrive at his destination
C.
keep in constant touch with the computer center
D.
inform the system of his destination by phone