The film star walked to his car,__________by a crowd of fan

The film star walked to his car,__________by a crowd of fans. A.to follow B.fol

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Lucy__________ ride a bike when she was three.

Lucy__________ ride a bike when she was three. A.should B.must C.could D.Need

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以下代码中为恒权码的为( )。

以下代码中为恒权码的为( )。 A.8421BCD码 B.5421BCD码 C.余三码 D.格雷码

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串联型稳压电路如上图所示,已知U2=l8V,R1=R2=RW,UZ=3.3V,UBE=0.7V,输出的可调范围为(  )

串联型稳压电路如上图所示,已知U2=l8V,R1=R2=RW,UZ=3.3V,UBE=0.7V,输出的可调范围为(  )V。 A.12~18 B.9~18 C.

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串联型稳压电路中,调整管处于状态(  )。

串联型稳压电路中,调整管处于状态(  )。 A.饱和 B.放大 C.截止 D.开关

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