四川的最高峰是( )
A.峨眉山
B.四姑娘山
C.贡嘎山
D.龙门山
答案:A
Would you please _________loudly? [ ]
A. don't speak
B. not speak
C. not to speak
D. to not speak
简述一次风机跳闸后,锅炉RB动作过程?