听力原文:Ken :Hello, Rob.
Rob :Hello, Ken... Hello Barbara. Come in. Shall I take your coats?
Ken :Thank you very much. What a lovely house!
Rob :I'm glad you like it.
Ken :Where' s Anna?
Rob :Oh, she's in the kitchen. She'll be here in a minute. Just go into the dining room. How about a drink before dinner?
Ken :That's a good idea.
Anna :Here we are...,dinner's ready. Sit down, everybody.
Barbara :Thank you very much, Anna. Everything looks wonderful, and it smells delicious, too.
Anna :I'll put the salad in the middle of the table. Shall I serve you?
Barbara : No, it's all right. We can help ourselves.
Anna : Rob, could you pour the wine, please? Ken, help yourself to the vegetables, too.
Rob : Would you like some mere brandy, Barbara?
Barbara : Oh, no, thanks, no more for me. I'm driving tonight.
Rob : Oh, come on, just a little.
Barbara : No, really, I mustn't. Let me help you with the washing-up.
Rob : The washing-up! No, no, don't worry. We always leave that until the morning.
Rob : Here are your coats.
Ken : Thanks. It's been a marvelous evening. It was very kind of you to invite us.
Anna : Don't mention it. It was very nice to see you again.
Barbara : Well, we enjoyed ourselves very much.
Rob : We're so glad, you must come again.
Ken : Good ,fight, and thanks again.
Anna : Good night, and drive carefully. It's a very wet night.
(23)
A.Ken and Barbara are eating out tonight.
B.Rob and Anna are entertaining their friends at home.
C.Anna is cooking a big meal for a family party.
D.Old friends are gathering in Rob' s home to celebrate his birthday.
第1题
关于X线管代表容量的叙述,不正确的是
A.对固定阳极X线管,规定由单相全波整流电路供电,负载时间为1秒时的X线管容许负载为代表容量
B.对旋转阳极X线管,规定由三相全波整流电路供电,负载时间为 0.1秒时的管子容许负载为代表容量
C.X线管允许输人的最大功率与整流方式和曝光时间有关
D.—定整流方式和一定曝光时间下X线管所能承受的最大负荷称作该X线管的定容量
E.对旋转阳极X线管,规定由三相全波整流电路供电,负载时间为1秒时的管子容许负载为代表容量
第2题
A.对固定阳极X线管,规定由单相全波整流电路供电,负载时间为1秒时的X线管容许负载为代表容量
B.对旋转阳极X线管,规定由三相全波整流电路供电,负载时间为1秒时的管子容许负载为代表容量
C.X线管允许输入的最大功率与整流方式和曝光时间有关
D.—定整流方式和一定曝光时间下X线管所能承受的最大负荷称为该X线管的额定容量
E.对旋转阳极X线管,规定由三相全波整流电路供电,负载时间为1秒时的管子容许负载为代表容量
第3题
对X线管代表容量的叙述不正确的是
A、对固定阳极X线管,规定由单相全波整流电路供电,负载时间为1秒时的X线管容许负载为代表容量
B、对旋转阳极X线管,规定由三相全波整流电路供电,负载时间为0.1秒时的管子容许负载为代表容量
C、X线管允许输入的最大功率与整流方式和曝光时间有关
D、一定整流方式和一定曝光时间下X线管所能承受的最大负荷称作该X线管的额定容量
E、对旋转阳极X线管,规定由三相全波整流电路供电,负载时间为1秒时的管子容许负载为代表容量
第4题
不是高压整流方式的是
A.三相自整流
B.单项全波
C.单相自整流
D.三相六波
E.单相半波
第5题
定义旋转阳极X线管的代表容量时,整流方式规定为
A.单相半波整流
B.单相全波整流
C.三相六管半波整流
D.三相六管全波整流
E.三相12管全波整流
第6题
对单相全波整流X线机,下列说法正确的是()
A.流过X线管的电流是脉动直流,流过高压变压器次级中心点的电流是交流电
B.流过X线管的电流是交流电,流过高压变压器次级中心点的电流是脉动直流
C.流过X线管的电流和流过高压变压器次级中心点的电流都是交流电
D.流过X线管的电流和流过高压变压器次级中心点的电流都是脉动直流
E.在单相全波整流电路的次级中心点可以直接串入直流毫安表来测量管电流
第7题
关于半波自整流X线机高压次级电路的描述正确的是
A.当X线管阳极处于交流电的正半周,X线管内有管电流流过
B.当X线管阴极处于交流电的正半周,X线管内有管电流流过
C.X线管不起整流作用
D.流过X线管和高压变压器次级的电流为交流电
E.流过X线管和高压变压器次级的电流为稳恒直流电
第8题
关于X线机的高压整流方式,错误的是
A.单相全波整流
B.单相半波整流
C.单相自整流
D.三相6波整流
E.三相全波整流
第9题
下列组合,错误的是
A.软组织摄影设备——钼靶X线管
B.电容充放电式X线机——三极X线管
C.X线管的输入功率单位——焦耳
D.X线管标称功率单位——千瓦
E.CT设备——大容量X线管
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