园林机械一旦发生电火灾，切不可用水扑救，可以用泡沫灭火器扑救。( )
参考答案：错
What the expert has said and done will be _______ to the department managers.
A．value
B．benefit
C．of valuable
D．of benefit
WK-4型挖掘机与WK-10型挖掘机的拉门电机功率各是多少？
