学生a说:汽车在紧急制动时,要马上踩住离合器,防止传动系过载而使发动机的机件损坏。学生b说:汽车在紧急制动时不用踩住离合器,离合器有传动系过载保护功能。他们说法正确的是()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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