Had I known her name, ___. A. or does she know mine? B. and where does she live? C. she would be beautiful D. I would have invited her t
[2012·重庆卷] 设四面体的六条棱的长分别为1,1,1,1，和a，且长为a的棱与长为的棱异面，则a的取值范围为( ) A．(0，) B．(0，) C．(1，) D．(1，) 图1－2
低温冷冻灾害主要是因为来自极地的强冷空气，寒潮侵入造成的连续多日气温下降，使农作物因环境温度过低而受到损伤以致减产的农业气象灾害。右
罗荣渠在《现代化新论》中谈到：中国的现代化是被延误了的现代化。关于这一问题学术界形成两种不同观点：一种观点可称之为外因论，“侵略一反
白磷（P4）分子呈正四面体结构（如右图所示），科学家受白磷分子的启发，又合成了结构和白磷分子类似的N4分子，下列关于P4和N4分子的说法正确的是
下列各面组物质的溶液逐滴互滴，前一种溶液逐滴滴入后一种溶液中，与后一种溶液逐滴滴入前一种溶液中产生的现象相同的是( ) ①NaHCO3和HCl ②HNO
. In the years____, the city government will take effective measures to bring the price of the house under control. A. following B. followed C. follow
