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【判断题】
良好的软填料密封是“轴承效应”和“迷宫效应”的综合。A.
正确
B.
错误
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【单选题】It was last Sunday ______ we saw one of my old friends in the park.
A.
which
B.
that
C.
where
D.
who
【单选题】It was__last Sunday morning. It rained__.
A.
snowy, heavy
B.
snowing, heavy
C.
snowy, heavily
【单选题】—So when did you meet Joan? —It was last Sunday _______ she came to visit my sister.
A.
that
B.
since
C.
when
D.
Before
【简答题】测得工作在放大电路中两个晶体管的三个电极电流如下图所示, 1判断它们各是NPN管还是PNP管,在图中标出e,b,c极; 2估算晶体管的 α 和 β 值。
【简答题】从方框中选择合适的选项完成短文。 Last Sunday My class went to the Central Zoo last Sunday. It was our first journey and we were all very happy. 1 Halfway to the zoo we stopped at a station because the driver of the b...
【单选题】如图所示电路中,测得工作在放大状态的某个晶体三极管两个电极电流,则第三个电极的电流大小、方向和管脚自左到右的顺序分别为( )。
A.
0.03mA,流进三极管:c、e、b
B.
0.03mA,流出三极管:c、e、b
C.
0.03mA,流进三极管:e、c、b
D.
0.03mA,流出三极管:e、c、b
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