A. 正确 B. 错误
A. 螺杆泵工作平稳 B. 有自吸能力 C. 成本较低 D. 防止粘度损失
A. 3±1,10 B. 4±1,15 C. 5,20 D. 3,10
A. water in the fuel B. cold lube oil C. excessive starting air pressure D. excessive fuel pressure