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【单选题】
如图所示,为( )整流电路的输出电压波形。
A.
mg src="http://p.ananas.chaoxing.com/star3/origin/f3fcf368e9fcced39eed7906dffe8656.jpg">
B.
单相全波
C.
单相半波
D.
单相桥式
E.
单相
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举一反三
【单选题】Tom ________ the radio when I came in.
A.
listened to
B.
was listening to
C.
listened
D.
was listening
【简答题】一个完整的磁盘存储器由三部分组成,其中,______又叫磁盘机或磁盘子系统,是独立于主机的一个完整的设备;______是磁盘机与主机的接口部件;______用于保存信息。
【判断题】一个完整的多媒体系统包括多媒体硬件系统和软件系统。()
A.
正确
B.
错误
【单选题】In a pre-listening activity, students need to learn to cope with some ambiguity in listeningand realize that they can still learn even when they do not understand every single word. The aimof this act...
A.
listening fir specific information
B.
listening for gist
C.
listening for structure
D.
listening for vocabulary
【简答题】A.By watching some films about World Environment Day. B.By listening to some lectures and planting trees, etc. C.By planting trees, having some green concerts, bicycle parades, etc. D.By delivering so...
【简答题】一个完整的计算机系统应当包括______系统和______系统。
【简答题】A.By watching some films about World Environment Day. B.By listening to some lectures and planting trees, etc. C.By planting trees, having some green concerts, bicycle parades, etc. D.By delivering so...
【单选题】备孕妇女膳食指南有( )条关键推荐。
A.
2
B.
3
C.
4
D.
5
【单选题】Li Lei wants to be a singer.He music. [     ]
A.
enjoy listening
B.
enjoys to listen to
C.
enjoys listening to
D.
enjoy listening to
【简答题】压缩式制冷系统是一个完整的密封循环系统,组成这个系统的主要部件包括压缩机、(8)、(9)、和(10)。
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