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【单选题】
现有四种元素的基态原子的电子排布式如下: 11s 2 2s 2 2p 6 3s 2 3p 4 ; 21s 2 2s 2 2p 6 3s 2 3p 3 ; 31s 2 2s 2 2p 3 ; 41s 2 2s 2 2p 5 。则下列有关比较中正确的是( )A.
第一电离能：④>③>②>①
B.
原子半径：④>③>②>①
C.
电负性：④>③>②>①
D.
最高正化合价：④>③＝②>①
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举一反三
【简答题】绘制电气图时,连接线一般采用____,无线电信号通路采用____,并且应尽量减少不必要的连接线,避免线条交叉和弯折。
【单选题】Mr. Robinson could start the new job in
A.
three weeks.
B.
six weeks.
C.
eight weeks.
【单选题】Mr Benn could start the new job in ______.
A.
two weeks.
B.
four weeks.
C.
six weeks.
【简答题】绘制电气图的时候,连接线一般采用( ),无线电信号通路采用( ),并且应该尽量减少不必要的连接线,避免线条( )和( )。
【单选题】'In the 1980s, the government promoted early retirement' is cited in Paragraph 2 as an example to
A.
show why older workers were less productive.
B.
illustrate the poor condition of keeping the old people in workforce in France.
C.
compare the condition of old people between France and the other developed countries.
D.
assess the policy of France government at that time.
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