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【单选题】
乳腺癌常转移到（ ）A.
左锁骨上窝淋巴结
B.
右锁骨上窝淋巴结
C.
颈部淋巴结
D.
腋下淋巴结
E.
以上都不是
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举一反三
【单选题】Enclosed are sample parts _____ some of the problems we encountered.
A.
which showing
B.
in which show
C.
from which show
D.
showing
【单选题】We encountered the pathetic sight of a family packing up its home..
A.
possible
B.
passionate
C.
pitiful
D.
annoying
【单选题】We have to think very carefully before we take any action, because it's a very serious situation we have encountered.
A.
ideal
B.
favourable
C.
good
D.
severe
【单选题】The polarity of U2 encountered first as we travel around the loop is ( ).
A.
plus
B.
minus
C.
not sure
D.
zero
【简答题】在桥式整流、电容滤波、稳压管稳压直流电源电路中,变压器副边电压为 10V ,则整流后的 U O(AV) = ( ) V ,滤波后的 U O(AV) = ( ) V ,二极管所承受的最大反向电压为( )。
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