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【单选题】
点 M 沿平面曲线运动,在某瞬时,速度大小v=6m/s ,加速度大小 ,两者之间的夹角为30 ,如图所示,则点 M 所在之处的轨迹曲率半径 为( )。A.
1.5m
B.
4.5m
C.
m
D.
9m。
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【单选题】In more than a century of hand-to-hand combat in shops, supermarket aisles, restaurants and bars around the world, Coca-Cola has nearly always been in the lead and Pepsi in second place. When Warren B...
A.
Mr. Buffett is the investor of Coca-Cola.
B.
Pepsi is served in the pizza parlour.
C.
Coke is now served in the pizza parlour.
D.
Coke used to win the battle against Pepsi.
【简答题】本书中,希望放大电路的输入电阻越()越好,因为重点讨论电压对电压放大倍数。
【单选题】I was really angry about his behavior. He acted as if nothing _____________.
A.
has happened
B.
had happened
C.
happened
D.
would happen
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