可燃性粉尘与空气混合物的温度降低,其爆炸危险性( )。
A.增大
B.减小
C.不变
D.不一定
参考答案:B
解析:可燃性粉尘与空气混合物的温度降低,其爆炸危险性减小。
补全对话。
A: What are you going 1 2 when you 3 up?
B: I'm going to be a baseball 4 .
A: 5 are you going to do that?
B: I'm going to 6 baseball every day.
A: 7 are you going to practice?
B: I'm going to practice in the sports center.
A: 8 do you 9 there?
B: I get there 10 a bike.
1.______2.______3.______4.______5.______
6.______7.______8.______9.______10.______
Lb3F4022试述冲击反循环钻机钻孔时的注意事项。