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【单选题】
下列各种局部通风方法中属于利用主要通风机风压通风的是（）。A.
自然通风
B.
风障导风
C.
局部通风机通风
D.
引射器通风
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【单选题】Not until many years later______
A.
the whole truth became known
B.
did the wholetmth become known
C.
the whole truth has become known
D.
has the t讯th become known
【单选题】均值99%的置信区间常用于( )
A.
某指标的可能取值范围
B.
估计健康人群99%观察值所在范围
C.
99%样本均值在该范围内的估计
D.
总体均值有99%的可能在该范围内估计
【单选题】Not until many years later______
A.
the whole truth became known
B.
has the truth become known
C.
the whole truth has become known
D.
did the whole tmth become known
【单选题】Not until many years later______
A.
the whole truth became known
B.
has the truth become known
C.
the whole truth has become known
D.
did the whole truth become known
【单选题】Not until many years later___known.
A.
the whole truth became
B.
did the whole truth become
C.
the whole truth become
D.
the whole truth had become
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