叶轮在轴套上不能自动调整间隙会造成真空泵轴功率过大。
参考答案：对
To tell________truth, his coming is really_________big surprise to most people present at the party.
A．/ ; a
B．the ; /
C．the ; a
D．/ ; /
JN43-80型推焦车的最大推焦行程为20.15米。
