工作斗下部应有水雾喷头，喷头开启后水雾应能覆盖工作斗下部。
参考答案：对
(2013·高考陕西卷)—Shall we go for a drink at one o’clock this afternoon?
—________.Will two o’clock be OK?
A．Sure，it’s up to you
B．Sure，no problem
C．Sorry，I can’t make it
D．Sorry，I’m not available today
房室结内折返性心动过速通常发生于( )
A．心肌炎B．无器质性心脏病者C．冠心病D．药物中毒E．高血压病
