颈椎病中神经根型的发病率为
A．20%～30%B．31%～39%C．40%～50%D．60%～70%E．75%～85%
参考答案：D
一只标有“PZ220-100”的白炽灯泡，“220”表示该灯泡的______，当它接入110V的电路时，则实际功率是______W．（假设灯泡电阻不受温度影响）
-----Could you tell me ?
----It is hard to say.
A．when will the plane arrive
B．who will win the match
C．weather the whether will get fine
D．where has we met
