A:b导管连接供给氧气的钢瓶
B:b导管连接病人吸入氧气的输气管
C:使用该装置用来观察是否有氧气输出
D:使用该装置用来观察氧气输出的速率
The man______of shooting 6 school children was caught by Beijing police,the XIN HUA News Agency reported on Friday.( )