单项选择题

牙根是嵌入牙槽内的部分，借牙周膜与牙槽骨牢固相连。（）

A．对
B．错

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A massive tractor is rolling down a country road. In a perfectly inelastic collision, a small sports car runs into the machine from behind. Which vehicle experiences a change in momentum of larger magnitude? ( )

A．The car does.
B．The tractor does.
C．Their momentum changes are the same size.
D．It could be either vehicle.

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实验测得某有源二端线性网络看来路电压为，短路电流，则该网络的戴维南等效电压源的参数为（）
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