基尔霍夫第二定律（回路电压定律）是说：沿一回路所升高的电位（）沿此回路所降低的电位。
A.不等于
B.等于
C.大于
D.小于
参考答案：B
The Japanese government stubbornly claimed the ownership of Diao Yu Islands belonging to China, ______ greatly hurt the friendship between the two peoples.
A．that
B．what
C．which
D．it
简述园路的照明原则。
