【单选题】The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner .
A.
in the event of a flame failure
B.
in the event of a stack fire
C.
when the water level reach the crown sheet
D.
when the feed pump discharge pressure drops to a preset minimum
【判断题】我国的社会主义经济制度的基础是生产资料的社会主义公有制,即全民所有制和劳动群众集体所有制。( )
【判断题】我国社会主义经济制度的基础是生产资料的社会主义公有制,即全民所有制和劳动群众集体所有制。
【单选题】在MATLAB命令窗口中执行( )命令,将工作空间窗口的变量清空。
【单选题】_____ is used for sensing the temperature of the room in the air condition system.
【单选题】Temperature sensing protective devices operate a control circuit which can ______the current when the device reaches a predetermined temperature.
【单选题】时速 200~250km动车组列车商务座、特等座、()不超员