若为奇数,被除所得的余数是( ) A.0 B.2 C.7 D.8
A couple of years ago, I came to a lady’s house to buy some vitamins. Upon entering the house, I 21 that there was an electronic keyboard on a stand, leaning 22 the wall. Be
E Should struggling students be banned from clubs and sports? Getting a bad grade in Rockingham, Vt. could get you kicked off the team! School officials there are considering new guidelines that would
C(s)+H2O(g)═CO(g)+H2(g)△H=+131.3KJ/mol.它表示( ) A.碳与水反应吸收131.3 KJ的热量 B.固态碳和气态水各1mol反应,放出131.3 KJ的热量 C.1mol碳
下列各组词语中加线的字是多音字,其中有两种读音的一组是 ( ) A.舆论哄然 一哄而散四处哄传哄逗小孩 B.应接不暇 应有尽有点头应允应答如流 C.
已知数列的通项,. (Ⅰ)求; (Ⅱ)判断数列的增减性,并说明理由; (Ⅲ) 设,求数列的最大项和最小项.
已知在1×105Pa,298K条件下,2mol氢气燃烧生成水蒸气放出484kJ热量,下列热化学方程式正确的是 ( ) A. H2O(g) === H2(g)+错误!未找到引用源。O2(g) △H
下列各项中,可以构成天体系统的是 …( ) A.地球和太阳 B.北斗七星 C.地球和月球 D.大熊