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【多选题】
Boost型功率因素校正器的优点有A.
输入电流连续，电磁干扰小
B.
输入、输出之间有绝缘隔离
C.
有输入电感，可防止电网的高频瞬间冲击
D.
开关器件的耐压值不超过输出电压值
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反馈参考答案：
举一反三
【单选题】— ______ do you go for a picnic? — Three times a year. [ ]
A.
How often
B.
How many times
C.
How long
D.
How many time
【单选题】— ______ do you _____ the medicine? — Three times a day. [ ]
A.
How often; eat
B.
How many times; take
C.
How often; take
D.
How long; have
【单选题】________did you surf the Internet this week? Three times.
A.
How
B.
How old
C.
How often
D.
How many times
【简答题】How many times had the traveller flown by plane?
【简答题】How many times of discussion will they attend in Beijing?
【简答题】需求:某学校需要为机房配置无盘站的服务器ATX电源。 分析:既然是服务器ATX电源,为无看工作站服务,一定需要搭建多个硬盘,且服务器 要长时间不要求:间断运行,因此品牌知名、功率大的ATX电源是最佳选择。 要求:请仔细分析,完成下面表格。
【单选题】How many times was the average employee late?
A.
Three times a week
B.
Fifteen times a week
C.
Three times between January and June
D.
Fifteen times between January and June
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