Can I _ you to open the window? [ ]
A. bring
B. take
C. let
D. trouble
答案:D
当采用平衡压力式泡沫比例混合器时,泡沫液的进口压力应大于水的进口压力,但其压差不应大于()MpA、
A、0.1
B、0.2
C、0.3
D、0.4
A.FDM
B.TDM
C.CDMA
D.SDM