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某烃A与 发生加成反应，生成二溴衍生物B；用加热的NaOH乙醇溶液处理B得到化合物C；经测试知C的分子中含有两个，分子式为 ；将C催化加氢生成环。试写出A、B、C的结构。 （1）A．__ _ _ ____、B．__ _ _____、C．____ _ ___。 （2）写出由B得化合物C的反应方程式 ；该反应的反应类型是 反应 （3）已知卤代烃可以和钠发生反应，例如溴乙烷与钠发生反应为：2CH 3 CH 2 Br + 2Na → CH 3 CH 2 CH 2 CH 3 + 2NaBr应用这一反应，下列所给化合物中可以与钠合成环丁烷的是： A．CH 3 Br B．CH 3 CH 2 CH 2 CH 2 Br C．CH 2 BrCH 2 CH 2 Br D．CH 2 BrCH 2 CH 2 CH 2 Br
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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
【单选题】Parasite power is very useful for applications ______ require remote temperature sensing or that are very space constrained.
A.
what
B.
while
C.
that
【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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