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【简答题】
Work in groups to finish the following work according to the requirements. 1) Give the names of the following ground facilities. A. This is the unit which provides flight information service to aircraft flying within a certain region. a c c B. It is a terminal facility whose function is to control aircraft operations of takeoff, landing, and provide other service s to aircraft operating in the vicinity of an airport. a c C. The facility ’ s function is to provide services for arriving or departing aircraft. a c /r d /r a D. This is radar equipment designed to enable pilots of aircraft to be given guidance during the final stages of the approach to land. p a r E. It is a service provided for the purpose of giving advice and information useful for the safe and efficient conduct of flight. f i s 2) What are their call signs? A. A unit with which aircraft contact for start up. B. It is a service unit that pilots have to contact prior to starting engines. A nd it provides aircraft with departure information which should be read back by the pilot, if the read back isn ’ t correct the aircraft will not be released. C. It is such a unit that the operator who provides service to the aircraft is not necessarily able to view any part of the aerodrome or surrounding airspace. D. It is a unit whose service for aircraft movement is limited within the parking area. E. A facility with an antenna sending signals for aircraft direction finder to return to airfield.
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举一反三
【简答题】五氯化磷的分解反应为 PCl 5 (g) === Cl 2 (g) + PCl 3 (g) 在一定温度和压力下,反应达平衡,改变如下条件,五氯化磷的解离度如何变化?为什么?(设均为理想气体) ( 1 )降低气体总压; ( 2 )通入氮气,保持压力不变,使体积增加一倍; ( 3 )通入氮气,保持体积不变,使压力增加一倍; ( 4 )通入氯气,保持体积不变,使压力增加一倍。
【单选题】PCl5(五氯化磷)的分解反应PCl5(g) == PCl3(g) + Cl2(g)在473 K达到平衡时PCl5(g)有48.5%分解,在573 K达到平衡时,有97 %分解,则此反应是
A.
吸热反应
B.
放热反应
C.
标准摩尔 反应吉布斯自由能变为零 的反应
D.
在这两个温度下标准平衡常数相等的反应
【简答题】下述原子在基态时含有未配对的电子数为 ( 1 ) Mn____ ; ( 2 ) Fe_____ 。
【简答题】绝缘子湿闪络电压是指雨水在降落方向与绝缘子表面呈()度角淋在绝缘表面时,使其闪络的最低电压。
【多选题】关于胃的动脉,下述说法正确的是
A.
胃左动脉起自腹腔干,并有分支营养食管腹段
B.
胃右动脉沿胃小弯向左走行
C.
胃网膜左动脉的终支多与胃网膜右动脉吻合,形成胃大弯动脉弓
D.
胃网膜右动脉沿胃大弯向右走行分布于胃前、后壁
E.
胃后动脉起自腹主动脉,分布于胃底后壁
【单选题】绝缘子湿闪络电压是指雨水在降落方向与绝缘子表面呈( )度角淋在绝缘子表面时,使其闪络的最低电压。
A.
20
B.
30
C.
45
D.
60
【单选题】五氯化磷分解反应为 PCl 5 (g)=PCl 3 (g)+Cl 2 (g) ,已知 298.2K 、 100kPa 下反应的标准摩尔反应焓为 88 k J· mol -1 ,标准摩尔反应熵 170.27J· mol -1 · K -1 ,则反应的标准摩尔反应吉布斯函数变约为( )。
A.
- 37225 J· mol -1
B.
-50.686.5 J· mol -1
C.
37225 J· mol -1
D.
50.686.5 J· mol -1
【判断题】绝缘子湿闪络电压是指雨水在降落方向与绝缘子表面呈45度角淋在绝缘表面时,使其闪络的最低电压。
A.
正确
B.
错误
【单选题】在下图所示的电路中, A、B两点间的电压UAB值为( )V。
A.
1
B.
-1
C.
2
D.
-2
【简答题】下述原子在基态时含有未配对的电子数为:(2分) (1)Mn____; (2)Fe_____。
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