磨基音压低报警,怎么办?
参考答案:
磨机音压低报警,说明一仓满,应根据情况酌情减料运行,待磨机音压上升到一定范围,再将物料量慢慢调整到合适的下料量,以保证磨机稳定运转。
如图所示的小男孩手持篮球正对平面镜站立,他在平面镜中的像是图中的( )
A.
B.
C.
D.
The story books___ by the writer in the 1960s. [ ]
A. are written
B. were written
C. wrote