75为检查司机是否酒后驾车采用呼吸分析仪,其中装有K2Cr2O7+H2SO4,如果司机血液中含乙醇量超过标准,则该分析仪显示绿色,其原理是:
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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