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【单选题】
一药厂为了解其生产的某药物（同一批次）的有效成分平均含量的95%可信区间时，应用A.
(`x-t(0.05/2，ν)Sx，`x+t(0.05/2，ν)Sx)
B.
(`x-1.96σx，`x+1.96σx)
C.
(`x-t(0.05/2，ν)S，`x+t(0.05/2，ν)S)
D.
(`x-1.96σ√x，`x+1.96√x)
E.
(p-1.96Sp，p+1.96Sp)
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【单选题】—Jack, did you see my son Harry just now? —No，Mrs. White. I _______computer s.
A.
have played
B.
am playing
C.
had played
D.
was playing
【简答题】对电梯及电梯井的以下设计要求中，哪个是错误的?（ ）
【简答题】.----I can’t find Jack. Where did you see him this morning? ----It was in his factory _______he worked. A．where B．which C．that D．on which
【单选题】—Did you see Jack at the wedding party? —No, he ______ by the time I ______ there.
A.
had left.., got
B.
left.., had got
C.
has left.., got
D.
left.., got
【多选题】消防控制室应设置火灾警报装置与应急广播的控制装置，其控制程序应符合______要求。
A.
二层及二层以上楼层发生火灾，宜先接通着火层及其相邻的上、下层。
B.
首层发生火灾，宜先接通本层、二层及地下各层。
C.
地下室发生火灾，宜先接通地下各层及首层。
D.
地下室发生火灾，宜先接通首层。
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