T2*值()
A、短于T2
B、等于T2
C、长于T2
D、等于T1
E、长于T1
参考答案:A
According to their researches,a strong social support system can protect people diseases such as heart trouble,depression. [ ]
A.against
B.with
C.in
D.of
计算比较相对指标( )
A.只能是两个总量指标对比
B.只能是两个相对指标对比
C.只能是两个平均指标对比
D.既可以是两个总量指标对比,也可以是两个相对指标或平均指标对比