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【判断题】
广义表中原子个数即为广义表的长度。( 任何一个非空广义表,其表头可能是单元素或广义表,其表尾必定是广义表。A.
正确
B.
错误
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【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
【简答题】在茶艺服务接待德国客人时,不要向其推荐( )茶点。
【单选题】_____ is used for sensing the temperature of the room in the air condition system.
A.
An expansion valve
B.
An evaporator
C.
A thermostat
D.
A condenser
【单选题】temperature sensing protective devices operate a control circuit which can ( )the current when the device reaches a predetermined temperature.
A.
switch off
B.
switch on
C.
operate
【单选题】Temperature sensing protective devices operate a control circuit which can ______the current when the device reaches a predetermined temperature.
A.
switch off
B.
switch on
C.
operate
D.
无
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