水解机下料阀为气动阀,所以即便停电也不影响水解机出料。
参考答案:错
解析:水解机下料阀为气动阀,停电时不影响阀的开关,但水解机主轴停止,因此无法下料。
—What did the headmaster _______ at the meeting?
—Sorry. I left the meeting before he _______.[ ]
A. say; said
B. say; spoke
C. speak; said
D. speak; spoke
室内消火栓栓口处的静水压力应不超过( )m水柱。
A.50 B.70C.80 D.100