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【单选题】
欲比较某县正常成年男性的血红蛋白含量是否高于该省正常水平，应采用A.
样本均数与总体均数比较的T检验
B.
配对T检验
C.
T检验
D.
配对设计差值的符号秩和检验
E.
设计两样本比较的秩和检验
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皮皮学刷刷变学霸
举一反三
【单选题】By the time of next year he ______ writing this novel.
A.
will have finished
B.
have had finished
C.
will finished
D.
has had finished
【单选题】下列各组化合物均为路易斯酸的是?
A.
CH3NH2，CH3NH2+，CO，HCO3-
B.
BF3，AlCl3，FeCl3,HCO3-
C.
BF3，AlCl3，FeCl3
D.
H2O,CH3N+H3,H2SO4
【单选题】The novel______, he went to America with his family to have a trip.
A.
finished
B.
being finished
C.
having finished
D.
having been finished
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