对于深井曝气的特点说法错误的是()。
A.产泥量低
B.动力效率较低
C.耐冲击负荷能力强
D.不受气候条件影响
参考答案:B
The milk must be preserved at this temperature until it ____.
A.will process
B.is processed
C.has processed
D.had been processed
看施工图,一定要把平面图、立面图、剖面图结合起来,搞清三者关系。( )