In a ordinary cargo crane, ______is fitted to rotate the crane.
A.the slewing motor
B.the luffing motor
C.the hoisting motor
D.the fan motor
正确答案:A

In a ordinary cargo crane, ______is fitted to rotate the crane.
A.the slewing motor
B.the luffing motor
C.the hoisting motor
D.the fan motor
正确答案:A