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【单选题】
关于燃油闪点理解正确的是： Ⅰ、重质燃油的闪点高于轻质油，危险程度比轻质油大 Ⅱ、燃油闪点是反映火灾危险程度的指标 Ⅲ、为保证安全，应急设备使用的燃油闪点不得高于环境温度A.
Ⅰ+Ⅱ
B.
仅Ⅱ对
C.
Ⅱ+Ⅲ
D.
Ⅰ+Ⅲ
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