That music _____ interesting. [ ]
A. is sound
B. sounds
C. does sounds
D. is sounds
答案:B
如图通过管路,水被水泵吸出,其流量为40L/s。d1=200mm,d2=150mm,不计水头损失,h=1.5m,水泵全效率为0.7,则水泵轴功率为()kW。
A.10.68
B.10.58
C.11.57
D.11.34
对磺胺类过敏者慎用( )
A.强心苷B.甲氨蝶呤C.青霉素GD.丙米嗪E.磺酰脲类降糖药