2台抽水机3小时可以浇地1.2公顷,照这样计算,2台抽水机7小时可浇地多少公顷?
1.2÷3×7,
=0.4×7,
=2.8(公顷);
答:2台抽水机7小时可浇地2.8公顷.
The baby stopped and began .
A.to cry, laughing
B.to cry, laughed
C.crying, to laugh
D.cried, to laugh
防磨防爆检查技术要求?