血、尿中尿素测定的方法有( )
A．酶偶联法
B．次氯酸盐显色法
C．二乙酰一肟法
D．双缩脲法
E．电泳法
参考答案：A,B,C
We should bear in mind that social development and balance of nature should go in ________. [ ]
A. company
B. sympathy
C. association
D. harmony
