英语TUB、E指（）

[单选题]Fins are installed on the generating tube surfaces in waste heat boilers to （）.A . prevent soot fires in the exhaust systemB . prevent exhaust gas erosion of the tubesC . increase the velocity of exhaust gas flowD . increase the rate of heat transfer

[单选题]F．usible plugs are installed in fire-tube boilers to _____.A．provide a means of draining the boilerB．warn the engineer of low water levelC．cool the crown sheet at high firing ratesD．open the burners electrical firing circuits

[单选题]在MGW上，TUB板位于（）A . 主机框的4&5槽位B . 扩展机框的5&6槽位C . 主机框的2&3槽位D . 扩展机框的2&3槽位

[单选题]The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.A . operating the boiler at less than normal water levelB . installing fins on the firesides of water-tubesC . increasing the amount of excess air to the burnersD . tre

[单选题]英语AMPLIFIER指（）A .放大器B .火灾盘C .检测元件D .通气孔

[单选题]英语ELECTRICAL指（）A .电动的B .气动的C .电磁阀D .转换器

[单选题]英语TRANSMITTER指（）A .变送器B .调节器C .定位器D .转换器

[单选题]英语SWITCH指（）A .仪表B .开关C .按钮D .信号

[单选题]英语MEASURE指（）A .仪表B .测量C .按钮D .信号

[单选题]英语SPRING指（）A .活塞B .开关C .按钮D .弹簧