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【判断题】
(判断题)图示分压式偏置电路,三极管是硅管, U BE =0.7V ,如果三极管处于放大状态,可以通过调大 R b1 使三极管进入饱和状态。A.
正确
B.
错误
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举一反三
【单选题】As winter ________ the weather became colder.
A.
nearby
B.
advanced
C.
passed by
D.
approached
【简答题】拉马克的进化的原因和动力:()、()。
【单选题】The residents of this area had to make _____ to survive after the weather became much hotter and drier.
A.
adaptations
B.
tensions
C.
collapses
D.
status
【单选题】The headmaster said the school Art Festival will be put off the bad weather. [ ]
A.
became
B.
to
C.
because of
D.
at
【单选题】The water in the lakes and rivers in Yumnan became because of the dry weather. [ ]
A.
fewer and fewer
B.
more and more
C.
less and less
D.
little and little
【单选题】It is recorded that in 1892 the weather became so cold thaat the river ___ over.
A.
freezes
B.
was freezing
C.
has frozen
D.
froze
【简答题】机床坐标系是厂家设置的是()
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