-- Where is dad, mum?
-- He is ____his report in the room. He needs it for a meeting.
A:looking like
B:looking at
C:looking for
D:looking after
读中国疆域图,回答下列问题。
—Wow, they are wonderful.
解释诗句的意思。
醉里且贪欢笑,要愁那得工夫。
如图所示是实验室用某种电表的结构示意图,其中ad是闭合电路中的部分电路,电流表A的满偏电流(通过电流表的最大电流)是0.1A,R3=100Ω.