客车空调机组的电预热器所设置的温度开关式电热保护器断开值是()℃。
A.70±5
B.80±5
C.90±5
D.100±5
参考答案:A
.It is said that pandas ___________ in our country year after year.
A.are being disappeared
B.are disappearing
C.will be disappeared
D.will disappear
当球磨机的直径一定时,筒体越长,磨机生产率()。
A、越高
B、越低
C、不变