() is a precaution which contributes to av
问题:
() is a precaution which contributes to avoiding trouble under normal operating conditions.
A.Constant inspection
B.Keeping constant load
C.Remaining constant temperature
D.Varying speed
() is a precaution which contributes to avoiding trouble under normal operating conditions.
A.Constant inspection
B.Keeping constant load
C.Remaining constant temperature
D.Varying speed