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单选题
1900. 正常操作时确保释压活门关闭。释压活门打开表示燃油通气系统出现问题。
A
For normal operations, make sure the pressure relief valve is closed. An open pressure relief valve is a symptom of a problem in the fuel vent system.
B
For normal operations, make sure the shut off relief valve works; If you open pressure relief valve, that indicates a problem in the fuel vent system.
C
For normal operations, make sure you close the pressure relief valve. If you leave it open a problem will be shown in the fuel vent system.
答案解析
正确答案：A
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