【单选题】Who will travel with Irene?
C.
Wei Sum and Wei’s family
D.
Lily will travel alone.
【单选题】Who will travel with Lucy?
A.
She will arrive in Sydney
B.
She will plan to go to Australia with her sister.
C.
She will go to the airport by taxi.
D.
She can go to the airport information desk.
【单选题】幼儿园建筑中供幼儿使用的楼梯,其踏步高度应取( )mm。
【单选题】幼儿园建筑中供幼儿使用的楼梯,其踏步高度应取( )mm。
【单选题】Who will travel with Irene?
C.
Wei Sum and Wei’s family.
D.
Lily will travel alone.
【单选题】由555定时器组成的多谐振荡器如图所示,欲使振荡频率增高,则可( )。
【单选题】幼儿园建筑中供幼儿使用的楼梯,其踏步高度应取( )mm。
【单选题】由555定时器组成的多谐振荡器,欲使振荡频率增高,则可( )。
【单选题】由555定时器组成的多谐振荡器,欲使振荡频率增高,则可( )。 a.减小C b. 增大R1、R2 c.增大 UDD d.频率不可调