英译英2级
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考题题目（局方题库）
When the smoke control relay R648 energizes, it supplies 28v dc to energize the supply system control interrupt relay R645.
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核心词汇
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解题方法
When the smoke control relay R648 energizes, it supplies 28v dc to energize the supply system control interrupt relay R645.
A.When the smoke control relay R648 is powered, it gives 28v dc to activate the supply system control interrupt relay R645 .
B.As the smoke control relay R648 is connected, 28v dc is supplied to the supply system control interrupt relay R645.
C.When the smoke control relay R648 has power, it needs 28v dc to start the supply system control interrupt relay R645.
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考点精解
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正确答案：A
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