酒吧后场的清洁卫生很重要,每天应对冷藏箱外部除尘,冷藏箱内要定时清洁,一般要求是()。
A.每一天一次
B.每二天一次
C.每三天一次
D.每四天一次
参考答案:C
什么是常规根轨迹?什么是参数根轨迹?
—I thought Stephanie and Lee were getting married in June.
—No, that’s ________ her cousin’s wedding is.
A.where
B.when
C.why
D.how