定值电阻R1=10Ω,R2=5Ω,串联在电源电压不变的电路中时,通过R1的电流I1=0.2A,则电源电压U=____ V;若将两电阻并联在同一电路中时,干路中的电流I=____ A.
列有关亚洲的地理位置叙述不正确的是( )
____Shall we play in the playground?
____Can I learn to use the computer?
____Would you like to come here?
____What would you like for your birthday?
A. Sure.
B. Yes, I'd love to.
C. OK, let's go.
D. It's a secret.
在老师的指导下,张某等同学完成了以“城市垃圾状况分析及处理”为主题的社会调查,并向当地环保部门提出具体的建议。在这一活动中,张某等同学( )
①承担了属于环保部门的工作 ②行使了参与保护环境的权利
③增强了创新意识和实践能力 ④干涉了政府部门的工作
一Excuse me, but where's Mrs. Liu? I want to ask her for some advice. 一She the library. You can find her there.