测量身高和体重指标所得的变量是()
A.定量变量
B.定性变量
C.字符变量
D.无序变量
E.有序变量
参考答案:A
31. It’s not reasonable to regard all football fans as trouble makers — it’s only a few of them who are to blame for the violence.
A.potential
B.various
C.illegal
D.adequate
调节基因一般都位于操纵子附近,这种构造有利于调节基因对操纵子的控制。( )