注意: 1.短文必须包括所有内容要点,可适当发挥; 2.词数:100左右。 3.参考词汇: appearance 外貌 state of mind 心态 Dear Xiao Wang, I have received an
9、在约束条件下,当35时,目标函数z=3x+2y的最大值的变化范围是 A、[6,15] B、[7,15]C、[6,8] D、[7,8]
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.