若收、发信机损坏或收、发信机未加上电压，无线电双向采集终端将出现主控板自检正常，但电台不工作的故障。
参考答案：对
--- Daniel，why are you so late? We _______ you would be here an hour ago.
--- Sorry. I ________ know you were all here.
A．expect, don’t
B．expected; don’t
C．expected, didn’t
D．expect; didn’t
高炉煤气加热，流经途径是总管，主管，废气盘和（）。
A．砖煤气道
B．蓄热室
C．立火道
