一般（）在输水过程中沿程无流量变化。
A、取水管
B、送水管
C、配水管
D、输水管（渠）
参考答案：D
You ________ sleeping on the train. You were very loud![ ]
A. are
B. were
C. was
整个转炉炉壳钢板最厚部分是（）。
A.炉帽
B.炉身
C.炉底
D.出钢口
