单项选择题

A fashion trend may start when________?

A．An important person starts to wear different clothes.
B．An important person has a wide choice available in clothes.
C．The pace of change accelerates.
D．Fashion weeks are held in fashion capitals.

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单项选择题

A、 B、 C、 D、

判断题

药物预防就是利用对微生物具有灭杀或抑制作用的化学药品，加到物资表面或内部等，达到灭菌防腐的目的。常见的药物有灭菌灵、多聚甲醛等。正确错误