燃气管道在安装完毕、压力试验前进行吹扫，吹扫介质为( )。
A．水 B．压缩空气 C．蒸汽 D．化学清洗剂
参考答案：B
Everything ________ into consideration, they thought the car was good enough though it was heavy on oil.
A．to take
B．taken
C．to be taken
D．taking
在Access中，不能建立索引的字段类型是( )
A．数字 B．文本 C．备注 D．日期
