下列二次根式中属于最简二次根式的是（   ）

根据对话内容，从方框中选择适当的选项补全对话, 选项中有两项是多余的。

A. What’s wrong, B. Shall we go out? C. Where are we going? D So we shall stay at home. E. Good idea! F. That’s all right. G. Let’s go out.

Jim: It’s Sunday today. I’m not going to school. ____   Dad?
Father: Let’s look at the map.
Mother: Shall we watch TV at home?
Jim: No.____ 
Father: Let me see. We shall go to that park. It’s near the sea.
Jim:  ____ 
Father: We shall have a swim in the sea. Then we shall have a meal at the seaside.
Jim: Great!
Father: Come on! Let’s all get into the car.
Jim: ____  Dad?
Father: There’s something wrong with the car.
Mother: ____ 

My mom and dad like to come and watch me________．

将矩形ABCD绕点A顺时针旋转α（0°＜α＜360°），得到矩形AEFG．

如图1为一恒温水箱电路结构示意图，包括控制电路和工作电路两部分，控制电路：电源电压恒为12V，R₁为热敏电阻（置于水箱中），阻值随温度变化的关系如图2所示，R₀为滑动变阻器，线圈电阻不计，线圈中电流大于0.2A时衔铁被吸下；工作电路：R₂为电热器，上面标有“220V  1000W”的字样，L₁、L₂为红绿指示灯，其额定电压均为220V，加热时红灯正常发光，绿灯不亮，停止加热时绿灯正常发光，红灯不亮．