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单选题
A firebox explosion in an automatically fired auxiliary boiler may be the result of （）
A
excessive purging before lighting off
B
insufficient trail for ignition period
C
a faulty transformer in the ignition circuit
D
insufficient purging before lighting off
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考题
单选题The purpose of the programmed purge cycle on an automatically fired auxiliary boiler is to（）A
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单选题The brickwork surrounding the firebox of a boiler is known as（）.A
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