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【单选题】
There is a great deal of geographical variation in the frequency of many surgical procedures—up to tenfold variation per hundred thousand between different areas in the numbers of hysterectomies, prostatectomies, and tonsillectomies. To support a conclusion that much of the variation is due to unnecessary surgical procedures, it would be most important to establish which of the following?
A.
A local board of review at each hospital examines the records of every operation to determine whether the surgical procedure was necessary.
B.
The variation is unrelated to factors(other than the surgical procedures themselves)that influence the incidence of diseases for which surgery might be considered.
C.
There are several categories of surgical procedure(other than hysterectomies, prostatectomies, and tonsillectomies)that are often performed unnecessarily.
D.
For certain surgical procedures, it is difficult to determine after the operation whether the procedures were necessary or whether alternative treatment would have succeeded.
E.
With respect to how often they are performed unnecessarily, hysterectomies, prostatectomies, and tonsillectomies are representative of surgical procedures in general.
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【单选题】在总压为101.33KPa,温度为85℃的情况下,理想溶液的A和B的饱和蒸汽压分别为116.9KPa、46KPa,则平衡时的液相组成xA选哪个?
A.
0.6
B.
0.78
C.
0.9
D.
0.85
【简答题】在总压为 101.33kPa 、温度为 85 °C下,苯和甲苯的饱和蒸汽压分别为 P A ° =116.9kPa 、 P B °=46kPa , 则相对挥发度 = ( ) ,平衡时液相组成 x A =( ) , 汽相组成 y A = ( ) 。
【单选题】在总压为101.33KPa,温度为85℃的情况下,理想溶液的A和B的饱和蒸汽压分别为116.9KPa、46KPa,则平衡时的汽相组成yA选哪个?
A.
0.90
B.
0.85
C.
0.75
D.
0.65
【单选题】在总压101.33kPa,温度85℃的条件下,苯、甲苯纯组分的饱和蒸汽压分别为116.9 kPa、46.0 kPa,则平衡时的液相组成为( )。
A.
0.65
B.
0.72
C.
0.78
D.
0.81
【单选题】不属于营造良好沟通氛围技巧的是
A.
融洽的题外话
B.
赞美
C.
保持距离
D.
善用道具
【单选题】在总压为 101.33kPa、温度为 85°C下,苯和甲苯的饱和蒸汽压分别 为 PA°=116.9kPa、PB°=46kPa,平衡时气相组成 yA=()
A.
0.75
B.
0.8
C.
0.85
D.
0.9
【单选题】在总压为 101.33kPa、温度为 85°C下,苯和甲苯的饱和蒸汽压分别 为 PA°=116.9kPa、PB°=46kPa,平衡时液相组成 xA=()
A.
0.78
B.
0.88
C.
0.98
D.
1.08
【判断题】发球队员击球时,后排队员与同列的前排队员平行,就为合法的。
A.
正确
B.
错误
【单选题】在总压101.33kPa,温度85℃的条件下,苯、甲苯纯组分的饱和蒸汽压分别为116.9 kPa、46.0 kPa,则相对挥发度为( )。
A.
0.45
B.
1.15
C.
2.37
D.
2.54
【单选题】在总压为 101.33kPa、温度为 85°C下,苯和甲苯的饱和蒸汽压分别 为 PA°=116.9kPa、PB°=46kPa,则相对挥发度 =( )
A.
1.04
B.
1.54
C.
2.04
D.
2.54
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