断路器能够做如下操作（）。A、分断电源电压 B、分断负载电流 C、只能断开负载电压不

As   小题1: she nor her husband smoked, Mrs. Trench was surprised to see cigarette ash on her doorstep as she entered the house. When she opened the living-room door, she was astonished to see a strange man fast   小题2: in an armchair! Taking care not to disturb him, Mrs. Trench left the house immediately. She called a taxi and went straight to the police station. When she got there, she lost no time to explain   小题3:  had happened and added that the man   小题4:  have got into the house   小题5:  an open window. Mrs. Trench returned home   小题6:  a police car together with two policemen. But it was too late: the man had disappeared. 小题7:  (hurry) upstairs, she went to her dressing-table. She smiled   小题8: relief when she saw that the only thing the man had taken was an imitation diamond necklace   小题9:  was almost   小题10: .

兴趣小组的同学从实验室中找到一只小灯泡，规格为“2.5 V 0.75w”，为探究小灯泡的电功率P和电压U的关系，利用下面可供选择的实验器材设计一个电路，测量包括零在内通过灯泡的电流和它两端的电压的多组数据，用P=UI分别得到它的电功率，并作出P-U²

图像进行探究。可供选择的实验器材有：

A．小灯泡工(2.5 V 0.75w)

B．电压表V(量程3 V，内阻约3K)

C．电流表A₁(量程100 mA，内阻约2 )

D．电流表A₂ (量程300mA，内阻约0.6 )E．滑动变阻器R₁(0~10) 

F．滑动变阻器置R₂(0～100) 

G．电源E(电动势4.0 V，内阻不计) 

H．开关S和导线若干

(1)在给定的虚线框中画出他们进行实验的电路原理图，指出上述器材中，电流表选择_________ (选填“A₁”或“A₂”)；滑动变阻器选择_________ (选填“R₁”或“R₂”)。

(2)某同学根据电路图连接实验器材，进行实验，测量了多组数据，测量结束后，应先断开开关，拆除_________两端的导线，再拆除其他导线，最后整理好器材。

(3)处理数据后，在坐标纸上作出P-U²图像，如图所示。可知图中图线并不是一条直线，你认为原因_________。

将运行中的应用程序窗口最小化以后，应用程序( )。

A．出错

B．被删除掉

C．停止运行

D．还在继续运行

洋地黄中毒所致的室性心动过速忌用（）。

A．利多卡因 

B．普罗帕酮 

C．苯妥英钠 

D．氯化钾 

E．直流电复律

丙烯酸清漆中（）颜料填补。

A、少量

B、有

C、部分

D、没有