输送聚合物母液,选择螺杆泵,其主要原因是()
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
中心销与前、后,左、右止挡的标准间歇是()mm。
A. 3±1,10
B. 4±1,15
C. 5,20
D. 3,10
If a diesel engine turned over freely but failed to start, the cause could be ()
A. water in the fuel
B. cold lube oil
C. excessive starting air pressure
D. excessive fuel pressure
CRH2C/CRH380A/AL型动车组300T设备TCR天线安装高度范围为()。
A. 155±2mm
B. 155±3mm
C. 155±5mm
D. 155±7mm