某景区的三个景点A、B、C在同一线路上,甲、乙两名游客从景点A出发,甲步行到景点C,乙乘景区观光车先到景点B,在B处停留一段时间后,再步行到景
目前,在全国人大代表中,西藏自治区有20名代表,其中12名为藏族公民。自治区十届人大常委会44名组成人员中,藏族和其他少数民族25名。这表明( ) A.
氢叠氮酸HN3与氢卤酸相似,它是易挥发的弱酸。下列叙述中不正确的是 A.它的水溶液中存在着N3-离子 B.是无色、有刺激性气味
某型号飞机的机翼形状如图所示,AB∥CD,∠DAE=37º,∠CBE=45º,CD=1.3m,AB、CD之间的距离为5.1m.求AD、AB的长.(参考数据:,,)
1根据下图所示的装置回答问题 A B C D E (1)写出标号①的仪器名称_____________。 (2)氨气(NH3)是
Many years ago,there lived a rich man who wanted to help the people of his town.But first he wanted to find out whether they deserved(应得到)his help.So he placed a very large stone in th
下列事实说明空气中有哪些成分? (1)木炭在空气中燃烧 (2)空气是制造氮肥的原料
In ancient times, dogs were mainly ______helping people hunt( 打猎) .Now they are more useful-they can help the blinds, search for the bad eggs.A.bad forB.used toC.used forD.good at