增压防爆系统正常启动后，应使录井仪器房内或远程钻台显示器内的空气压力高于外部（）为宜。
参考答案：0.02～0.03MPa
物质由______组成．
The old man asked the girl to take another seat he wanted to sit next to his wife.
A. because B. so that C. so
