问题
单项选择题
矿井通风压力若是由风机造成的机械风压，叫做（）
A.机械通风
B.自然通风
C.混合通风
D.上行通风
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
矿井通风压力若是由风机造成的机械风压，叫做（）
A.机械通风
B.自然通风
C.混合通风
D.上行通风
参考答案：A
| 完型填空。 | ||||
| One day Wilson went shopping __1__ Tracy and Ben. They went to the supermarket in the new shopping center. "__2__ do you buy things here?" Tracy wanted to know: "Because they are __3__ here than at the corner store near our home. "Mrs. Wilson said, "Help me __4__ the prices, please." The Wilson were not __5__ and Mrs. Wilson was always careful with her money. She looked carefully at the prices of things. She bought __6__ things in the supermarket. When they got home, the children said, "We don't think you saved money by going to the supermarket." "Of course I did," Mrs. Wilson said." __7__ was cheaper there. "We know," the children said, ''But we came home by taxi because we had too much to carry. The taxi save was more than the money that you saved!" Mrs.Wilson added everything __8__. Her children were __9__. "Well done," she said, "Next time we'll do the shopping __10__." | ||||
|