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问题 选择题

下列离子方程式正确的是

A．醋酸溶液中滴入少量氢氧化钠溶液：H++OH-= H2O

B．在小苏打溶液中滴入少量的氢氧化钡溶液：2HCO3-+Ba2++2OH-=2BaCO3↓+2H2O

C．硫酸铵溶液与氢氧化钡溶液混合加热：NH4++OH- NH3↑+ H2O

D．锌与稀硝酸反应：Zn+2H+=Zn2++H2↑

答案

答案：B

单项选择题

A little boy invited his mother to attend his school’s first teacher-parent meeting. To the little boy’s (1) , she said she would go. This (2) be the first time that his classmates and teacher (3) his mother and he felt (4) of her appearance. Although she was a beautiful woman, there was a severe sear (疤痕) that (5) nearly the entire right side of her face. The boy never wanted to (6) why or how she got the sear.At the meeting, the people were (7) by the kindness and natural beauty of his mother (8) the sear, but the little boy was still embarrassed (尴尬) and (9) himself from everyone. He did, however, get within (10) of a conversation between his mother and his teacher.The teacher asked (11) ," How did you get the scar on your face"The mother replied, " (12) my son was a baby, he was in a room that caught fire. Everyone was (13) afraid to go in because the fire was (14) , so I went in. As I was running toward his bed, I saw a long piece of wood coming down and I placed myself over him trying to protect him. I was knocked (15) but fortunately, a fireman came in and saved both of us. " She (16) the burned side of her face. "This scar will be (17) , but to this day, I have never (18) what I did. "At this moment, the little boy came out running toward his mother with tears in his eyes. He held her in his arms and felt a great (19) of the sacrifice (牺牲) that his mother had made for him. He held her hand (20) for the rest of the day.

第（1）空应选择（）

A．enjoyment     

B．disappointment 

C．surprise    

D．excitement
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单项选择题

“DSPLY SOURCE”信息表示（）

A.正、副驾驶显示使用了同一部的IRU信息

B.正、副驾驶显示使用了同一部的ADC信息

C.正、副驾驶显示使用了同一部的VOR信息

D.所有显示组件（DU）使用同一部DEU的信息
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