A.Cu+2HCl=CuCl2+H2↑ B.Zn+2HNO3=Zn(NO3)2+H2↑
C.2Fe+3H2SO4=Fe2(SO4)3+3H2↑ D.SO2+2NaOH=Na2SO4+H2O
E.Cu+2AgCl=CuCl2+2Ag F.Cu(OH)2+Na2CO3=CuCO3↓+2NaOH
G.2Fe+3CuCl2=2FeCl3+3Cu H.Ba(NO3)2+CuSO4=Cu(NO3)2+BaSO4↓
工地运来a吨水泥,每天用去b吨,用了3天,还剩下____吨。如果a=120,b=15,那么用去的水泥吨数与剩下的水泥吨数的最简单的整数比是____。
下列关于人体与外界气体交换的叙述,错误的是( )
elephant, America, it, play, eat
There is a big zoo in our city. In the zoo you can see many animals. Look! There is a big ____monkey there. Next to the monkey, there are two ____They are from Africa. They like____in the water. Look! That is a panda. It is two years old. It is from Sichuan, China. It ____bamboo and other plants. There is also a tiger in the zoo. ____favourite food is meat.