长方形一条边长为3cm,面积为12cm2,则该长方形另一条边长为( )cm。
4
—Do you think we can get there on time?
—Yes,_______ the truck doesn’t break down.
A.even if
B.unless
C.until
D.so long as
评价治疗前后红细胞沉降率是否有差别的检验假设()
A.治疗前后总体均数μ1=μ2
B.μ1≠μ2
C.治疗前后差值总体均数μ=0
D.治疗前后样本均数x1≠x2
E.x1≠x2