题目内容
(请给出正确答案)
[单选题]
Liu Ying is not at home now, perhaps she ____ .
A.is going out
B.went out
C.is out
D.had been out
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A.is going out
B.went out
C.is out
D.had been out
A.H₀:π₁≤π₂﹔H₁:π₁>π₂
B.H₀:π₁>π₂﹔H₁:π₁≤π₂
C.H₀:π₁=π₂﹔H₁:π₁≠π₂
D.H₀:π₁≠π₂﹔H₁:π₁=π₂
A.32.0km/h
B.32.5km/h
C.33.0km/h
D.33.5km/h
A.正确
B.错误
A、0.927
B、0.9946
C、3
D、2