A:C4H12S2
B:C2H6S
C:C2H6O2
D:C2H6
成语大比拼。
随风____ 飘飘____
You were supposed to ________ your words carefully now that you meant no offence.
变压器是一种重要的电器设备,对变压器的认识正确的是 ( )