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【单选题】
I was very disappointed not to be able to go to the jazz concert last Friday. The advertisement in the paper said that you could buy tickets at the theatre box in Richland Hills any day between 10:00 and 4: 00. Since I work from 9:00 to 5: 00, the only time I could go to the theatre was during my 45 minutes lunch break. Unfortunately, the theatre is on the other side of the town, and the bus service between my office and Richland Hills is not very good. But if you are lucky, you can make the round trip in 45 minutes. Last Monday, I stood at the bus stop for fifteen minutes wait not enough time left to make thing happened on Tuesday, and again the next day. On Thursday, my luck changed. I got on a bus right away and arrived at the theatre in exactly twenty minutes. When I got there, however, I found a long line of people at the box office. I heard one man say be had been waiting in line for over an hour. Realizing I would not have enough time to wait in line, I caught the next bus and headed back across the town. By Friday I realized my only hope was to make the trip by taxi, it was expensive, but I felt it would be worth it to hear the concert. The trip by taxi only took me 10 minutes, but it felt like an hour to me. When I got to the theatre, I was relieved to see that nobody was waiting in line. The reason, however, I quickly discovered, was that they had already sold all the tickets. The man learned ______ that there would be a concert last Friday.
A.
over the radio
B.
from one of his workmates
C.
from the newspaper
D.
from his friends
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【单选题】制冷系统采用的回热循环的过热是
A.
自然过热
B.
有害过热
C.
有益过热
D.
强迫过热
【简答题】随机抽取25个网络用户,得到他们的年龄数据(见教材第51页练习题3.1)。计算网民年龄的描述统计量,并对网民年龄的分布特征进行综合分析。(50分) 2、张先生为了验证自驾车上班是否比坐公交上班更好,在某两周选择自驾车上班,每天上班时间分别为: 32 、 30 、 33 、 35 、 30 、 30 、 32 、 40 、 35 、 31 分钟,而其后两周选择坐公交车上班,每天上班时间分别为: 38...
【单选题】采用回热循环,对()制冷系统有害。
A.
R12
B.
R22
C.
R717
D.
R502
【单选题】制冷系统采用回热循环的过热是()。
A.
自然过热
B.
有害过热
C.
有益过热
D.
强迫过热
【多选题】分子与分母可以互换的相对指标有(    )。
A.
结构相对指标    
B.
比例相对指标
C.
强度相对指标    
D.
比较相对指标
E.
计划完成程度相对指标
【单选题】采用回热循环,对( )制冷系统有害。
A.
A   R12
B.
B   R22
C.
C   R717
D.
D   R502
【判断题】内墙面涂饰时,应在顶棚涂饰完毕后进行,从上而下分段涂饰。
A.
正确
B.
错误
【单选题】制冷系统中采用回热循环的过热是( )。
A.
自然过热
B.
有害过热
C.
有益过热
D.
强迫过热
【单选题】内墙面涂饰时,应在顶棚涂饰完毕后进行,( )分段涂饰
A.
先前而后
B.
先后而前
C.
由上而下
D.
由左而右
【单选题】制冷系统采用回热循环的过热是。A、自然过热  B、有害过热  C、有益过热  D、强迫过热
A.
自然过热
B.
有害过热
C.
有益过热
D.
强迫过热
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