正常生产中,如换热器漏油着小火时应()。
A.改通流程降压
B.用蒸汽灭火和掩护漏点
C.立即报火警
D.装置紧急停车
参考答案:A, B
The doctor thought _____ would be good for you to have a holiday. [ ]
A. this
B. that
C. one
D. it
A.,正电荷
B.,正电荷
C.,负电荷
D.,负电荷