学校合唱团有女生156人,女生人数是男生人数的2倍.合唱团有男生多少人?
156÷2=78(人).
答:合唱团有男生78人.
如图所示一矩形断面通风管道,断面尺寸为1.2m×0.6m,空气密度ρ=1.20kg/m3,流速v=16.2m/s,沿程阻力系数λ=0.0145,流程长度L=12m的沿程压强损失为()N/m2。
A.28.14
B.31
C.34.25
D.45.51
词汇(10分)
小题1:There are too many children ____( 咳嗽)in her class today
小题2:Ben is ___(躺)on the grass and enjoying the sunshine.
小题3:Everyone has two ____(脚)
小题4:If you have a _____(胃疼),you should not eat anything
小题5:Can’t you see the__________ (标牌)”No parking ”at the corner?
小题6:A few ____(乘客)got on the bus just now
小题7:My sister is a ____(.护士)She works in a hospital.
小题8:Alice ________ (厌恶)to do the dishes, but she likes sweeping the floor.
小题9:Playing computer games too much is a ________(浪费) of your time.
小题10:My bike is broken. Could you ________ (借给)me yours, please?