下列做法，不利于节水的是[ ]
A．自流灌溉
B．喷灌
C．滴灌
D．生活用水，一水多用
答案：A
A．building West Bank barrier is legal
B．building West Bank barrier is illegal
C．building West Bank barrier is reasonable
D．building West Bank barrier is welcomed
电焊机械的二次线的电缆长度不应大于（）。
A、30m
B、35m
C、2～3m
D、50m
