产氢产乙酸菌把除乙酸、甲酸、甲醇以外的( )产生的中间产物,如丙酸、丁酸等脂肪酸和醇类等转化成乙酸和氢,并有C02产生。( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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