创意工业园区主要属于第几产业？
参考答案：
第一产业。
They stood on the top of the high building, ________ they could see the whole city.
A． in that
B．in which
C．form it
D．from where
25T型客车制动装置止回阀分解组成后反向充风600KPa，不得泄露。正向充风，两端压力不大于（）
A.20kpa
B.15kpa
C.30kpa
D.40kpa
