发酵过程中的质量平衡包括()。
A、碳平衡
B、氮平衡
C、基质平衡
D、氧平衡
E、氢平衡
参考答案:A, B, C, D
I can guess you were in a hurry. You _____ your sweater inside out.
A.had worn
B.wore
C.were wearing
D.are wearing
更换工作面煤墙失效的逼帮柱和片帮破网处的背帮处理,准备好回架后()的材料。
A.行人通道
B.支护
C.煤帮
D.采空区