轻型井点使用时，一般应连续抽水。正常的出水规律是(    )
A、先小后大，先清后浑
B、先大后小，先清后浑
C、先小后大，先浑后清
D、先大后小，先浑后清

All of the following are terms used to describe on-dema...

单项选择题All of the following are terms used to describe on-demand service companies except:

The ______ rations of many families during the Great De...

单项选择题The ______ rations of many families during the Great Depression led to near-starvation conditions in both urban and rural areas. （ ）

如果要显示信息画面，需要按下数控系统操作面板上的功能键（）。A、SYSTEMB、POSC、PROGD、MESS...

单项选择题如果要显示信息画面，需要按下数控系统操作面板上的功能键（）。A、SYSTEMB、POSC、PROGD、MESSAGE