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【单选题】
(Unit1 Text B)"I first joined Twitter two years ago as a means of keeping in touch with my son."The word "means" has the similar meaning with the one in:
A.
Twitter, for me, had become much more than just a means of staying in touch.
B.
Managing well means communicating well.
C.
He says it and he means it.
D.
He was born on the mean streets of the central market.
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举一反三
【单选题】John's face looked so pale, and his doctor suggested that he _________ a medical examination.
A.
would have
B.
have
C.
had
D.
has
【单选题】长度达到完整精米粒平均长度的()及以上的米粒,称为整精米。
A.
1/2
B.
2/3
C.
3/4
D.
4/5
【简答题】如图所示电路中,已知 V G =9V , R C =3 kΩ , R 1 =20 kΩ , R 2 =20 kΩ,U S =8V , I S =0.5mA , β=40 , V CES =0 ,二极管正向压降为零。 求( 1 )该电路的临界基极电流 mA、集电极饱和电流 mA; ( 2 )通过计算判断三极管处于何种状态 ,并求输出电压 V 0 = V。
【单选题】John's face looked so pale, and his doctor suggeted that he ________ a medical examination.
A.
would have
B.
have
C.
had
D.
has
【单选题】长度达到完整米粒平均长度的( )的米粒,为整精米。
A.
4/5
B.
2/3
C.
3/4
D.
完整的米粒
【单选题】建立数据字典的阶段是( )。
A.
系统规划
B.
系统分析
C.
系统设计
D.
系统实施
【单选题】长度达到完整精米粒平均长度的()的米粒,称为整精米。
A.
1/2
B.
2/3
C.
4/5
D.
完整的米粒
【单选题】三极管共发放大电路如图 1-8 所示,已知硅三极管的 β=100 ,则该电路中三极管的工作状态为 ( )
A.
截止
B.
饱和
C.
放大
D.
无法确定
【单选题】如果上道工序的轮廓度误差为0.03,最终零件要求的轮廓度误差为0.02,问至少尚需要几次走刀才能达到设计要求(设平均误差复映系数为0.85)? 。
A.
1 ;
B.
2;
C.
3;
D.
4。
【单选题】.长度达到完整精米粒平均长度的(   )及以上的米粒,称为整精米。
A.
2/3
B.
3/4
C.
1/2
D.
3/5
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