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【单选题】
电路如图所示，三相负载按星形联结，每相接一个 220V 、 60W 灯泡。若 S 1 断开， S 2 、 S 3 闭合后，中线又断开，则出现的情况是（ ）。A.
中线断开后灯1比灯2、灯3;
B.
中线断开后灯1不亮，灯2比灯3亮 ;
C.
中线断开后灯1不亮，灯3比2亮;
D.
中线断开后灯1不亮，灯2、3一样亮且都变暗;
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举一反三
【多选题】关于法律概念、法律原则、法律规则的理解和表述，下列哪些选项能成立?( )
A.
法律规则并不都由法律条文来表述，并非所有的法律条文都规定法律规则
B.
法律原则最大程度地实现法律的确定性和可预测性
C.
法律概念是解决法律问题的重要工具，但是法律概念不能单独适用
D.
法律原则可以克服法律规则的僵硬性缺陷，弥补法律漏洞
【单选题】Mr Smith had a trip to China last summer. Which of the following is the picture he took there? [ ]
A.
B.
C.
【单选题】Sam had a trip to Australia last summer. Which of the following is the picture he took there? [ ]
A.
B.
C.
【单选题】-What’s wrong with him? --The picture he came across____ his memory of a sad story in his childhood.
A.
set off
B.
took off
C.
gave off
D.
put off
【单选题】—What’s wrong with him? —The picture he came across his memory of a sad story in his childhood.
A.
put off
B.
took off
C.
set off.
D.
gave off
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