单选题:The film star walked to his car,__________by a crowd of fan 题目分类:英语 题目类型:单选题 查看权限:VIP 题目内容: The film star walked to his car,__________by a crowd of fans. A.to follow B.following C.followed D.to be followed 参考答案: 答案解析:
Lucy__________ ride a bike when she was three. Lucy__________ ride a bike when she was three. A.should B.must C.could D.Need 分类:英语 题型:单选题 查看答案
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. 分类:英语 题型:单选题 查看答案
如图1-4-1所示,方波信号激励的电路,已知:R=20Ω,L=1mH,C=1000pF,Im=l57μA,T=6.28μ 如图1-4-1所示,方波信号激励的电路,已知:R=20Ω,L=1mH,C=1000pF,Im=l57μA,T=6.28μs,求u。 图1-4-1【例1】图 分类:英语 题型:单选题 查看答案