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【单选题】
单相桥式全控整流电路带纯电阻负载,输入交流电有效值等于220V,负载电阻等于10欧,问晶闸管触发角等于90度时的输出电压大小是多少?A.
220V
B.
198V
C.
148.5V
D.
99V
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举一反三
【单选题】Mum, this is Dale, _______ this is Jay. They are both my friends. [ ]
A.
or
B.
but
C.
and
D.
OK
【简答题】影响花芽分化的因素有哪些?
【简答题】阅读材料，回答问题。 潜的通达人生 郑涌 在北京大学我所认识的教授之中，朱先生是我接触最多，也是忘年相交最深的一个。碰到不少北大的老师，都说朱先生很勤奋，甚至是最勤奋的一个。对此，朱老师解释说，这种勤奋，并不是出于明白，而恰恰是出于自己的不明白，因为有许多事情不明白而想尽快地弄明白，尽管如此，有些事情却始终未能弄明白。例如，关于生命究竟是怎么回事，他说自己并不了解。但是，又不能等了解了再去生活...
【简答题】简述红斑性狼疮细胞的形成机理。
【单选题】As I’ve examined what it means to be poor, it has become clear to me what I am most thankful for: both my tangible and my intangible good fortune. In the sentence above “both my tangible and my intang...
A.
tangible fortune: my 1999 car and my modest apartment. intangible fortune:the gift of creativity, the insight in my writing process, the friendship from my writer friends.
B.
tangible fortune:what I have at present. intangible fortune:the result for what I did good things is that I have confronted with kind people.
C.
tangible fortune:what I have done brings me a lot of appreciation from others. intangible fortune:what I will do to help others will be surely appreciated by others.
D.
tangible fortune:exceptionally good health; the appreciation I got from others both for my writing and my donating. intangible fortune:my insights to money(价值观), to society(世界观), to life(人生观) awards me with much more living space than before and my practice bring me with endless happiness.
【单选题】Both my friends and I ________ interested in football and Messi is our favorite star.
A.
is
B.
be
C.
are
D.
am
【单选题】My friends and I are interested in drawing, but _____ of us is good at it. [ ]
A.
neither
B.
both
C.
none
D.
all
【单选题】I will make friends with _______shares both my joys and sorrows.
A.
that
B.
anyone
C.
whoever
D.
whomever
相关题目：
【单选题】Mum, this is Dale, _______ this is Jay. They are both my friends. [ ]
A.
or
B.
but
C.
and
D.
OK