可燃性粉尘与空气混合物的温度降低，其爆炸危险性( )。A．增大 B．减小 C．不变

I’m Mary. I have a piece of good news to tell you. My parents bought a new flat in the centre of the city. The rooms are not big, but they are all comfortable. There are more rooms than our old flat. I am excited(激动) because I have my own bedroom. In the old flat, I share the bedroom with my sister.

My favourite room in the new flat is my bedroom. I can be alone (单独) in it. It is my own small world. I can listen to music, read comics and chat with my friends on the phone. I can also look for things on the Internet and send e-mails to my e-friends.

Kitchen is my favourite room, too. I like helping my mother with the cooking. She is not only a good teacher but also a good cook. She often teaches me how to make some different dishes. She lived in Sichuan when she was a child. So she likes hot food and she can cook very delicious hot food.

小题1:What’s Mary’s new flat like?

A．Big and comfortable

B．Small and not comfortable

C．Big but not comfortable

D．Small but comfortable小题2:Mary can do the following things in the bedroom except(除了)______.

A．play the piano

B．chat with her friends

C．send e-mails

D．listen to music小题3:Which room does Mary like best?

A．The kitchen

B．Her bedroom

C．The sitting room

D．Both A and B小题4:What does Mary’s mother do?

A．A teacher.

B．A nurse.

C．A housewife.

D．A worker.小题5:Where did Mary’s mother live when she was a child?

A．The old flat

B．The centre of the city

C．Sichuan

D．The new flat

SS8型电力机车低压试验：操作司机控制器1AC、2AC调速手轮一牵引位，（）的说法是错误的。

A、调速手轮置牵引“1～2位”，“零位’’信号显示灭

B、调速手轮置牵引“1～2位”，11KT、25KA释放，预备灯灭

C、调速手轮退回“0位”，置“9～10位”，“零位，，信号灯灭

D、调速手轮退回“0位”，置“9"10位”，“预备”信号显示灭

强心苷通过水解反应常得到脱水苷元的反应是（）

A.温和的酸水解

B.强烈的酸水解

C.温和的碱水解

D.强烈的碱水解

E.酶水解

气体继电器装在变压器的（）上.

电源缺相时对电动机的起动和运行危害：三相异步电动机在电源断一相时，电动机将无法起动。转子左右摆动，有强烈的“嗡嗡”声。若电动机在运行中电源缺一相，电动机仍然在继续转动，但出力将大大（）。如果负载不降低，电动机的定子电流势必（），引起发热，必须停止运行，否则可烧毁电动机。