下载APP
【单选题】
7# 一般蒸汽加热器选用( )阀门,这是因为一旦气源中断,阀门处于( )状态而停止加热,使设备不致因高温而发生事故或危险。
A.
气开、打开；
B.
气关、关断；
C.
气开、关断；
D.
气关、打开。
举报
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Most shoppers know the feeling. You stand in front of piles of organic produce and wonder what those premium prices are buying you over and above what you get from standard foods. Not a lot nutrition-...
A.
do not use naturally produced fertilisers
B.
produce carbon dioxide when removing weeds
C.
use high doses of weed-killer
D.
use too many resources to qualify for organic status
【单选题】某车间采用热风采暖，热媒为30kPa的蒸汽，加热器的理论排水量为200kg/h，所配疏水器设计排水量应是下列哪一项
A.
200kg/h
B.
400kg/h
C.
600kg/h
D.
800kg/h