单项选择题
The inner part of the condenser should be cleaned with （）.
A.gas oil
B.diesel oil
C.chemical compound
D.Freon-12
点击查看答案&解析
相关考题
-
单项选择题
In the cargo winch, spur reduction gearing transfers the motor drive to （）.
A.the toping light
B.the board brake
C.the fail-safe
D.the barrel shaft -
单项选择题
For occasional heavy loads, two cranes can be arranged to work together. The operating （） for deck crane motors may be hydraulic electric.
A.principle
B.medium
C.instruction
D.voltage -
单项选择题
In a general cargo crane, three principal movements are （）； （）； （）.
A.hoisting；luffing；slewing
B.lifting；raising；lowering
C.rotating；raising；handling
D.hosting；lowering；moving
