建筑高度小于100m的高层民用建筑内商场的管道井、电缆井，按规定应采取（）等防火措施

（）电梯机房允许安装其他设备。

小题1:The little boy held his mother’s hand f___________ when crossing the street.

小题2:The school is within walking d___________ of my house.

小题3:The time is a_____________ when we must think about buying a new house.

小题4:It was a great ___________（宽慰） to have rain after a long time of drought.

小题5:Have you ever read the original v________of the novel?

小题6:In the 1950s the Chinese government introduced ________(简化) Chinese characters.

小题7:He discovered the _________(废墟) of the old city in the nearby  countryside.

小题8:________ by his accent, he comes from the north of the country.(据他的口音判断)

小题9:How did you p_____ him into joining us? It’s amazing!.

小题10:I was told that he had made an unpleasant c_________ on my speech.

转让国有土地使用权的法定条件中的按照出让合同约定投资开发，属于房屋建设工程的，完成开发投资总额的( )以上，属于成片开发土地的，形成工业用地或者其他建设用地条件。

A．20%

B．25%

C．30%

D．40%

二尖瓣狭窄最早出现的症状是

A．咯血

B．水肿

C．头昏

D．发绀

E．呼吸困难

在有序列表(3，6，8，10，12，15，16，18，21，25，30)中，用二分法查找关键码值12，所需的关键码比较次数为______。