工作中的柴油机连杆所受载荷为（）
A．名义载荷
B．计算载荷
C．交变载荷
D．冲击载荷
参考答案：C
He went there and has stayed there . [ ]
A. three days ago; for three days
B. for three days; three days ago
C. three days before; three days
D. before three days; three days before
调节阀的流量特性应满足调节对象的静态特性的要求。
