根据《城镇燃气设计规范》,城镇地下中压燃气管道距街树水平安全间距为()
A、075米A
暂无解析
证明方程xxx1nn-1+n1的整数,在区间1,12内有且仅有一个实根;(II)记(I)中的实根为xn,证明limnnx存在,并求此极限
Hethoroughlyunderstoodthesociety__________.
ItwasthreeBritishsportsmenwho________banneddrugs.
Theproblem________whenthestudentsrefusedtodotheirhomework.
Ababymightshowfearofanunfamiliaradult,_______heislikelytosmileandreachouttoanotherinfant.