依据元素周期表及元素周期律,下列推测正确的是 ( ) A.H3BO3的酸性比H2CO3的强 B.Mg(OH)2的碱性比Be(OH)2的强 C.HCl、HBr
有关汽车站的叙述正确的是( ) A.人们出行接触最多的交通运输点是汽车站 B.城市长途汽车站一般在交通比较闭塞偏僻的地方 C.汽车站常远离
室温下等体积混合0.1 mol·L-1的盐酸和0.06 mol·L-1的Ba(OH)2溶液后,溶液的pH等于( ) A.2.0 B.12.3 C.1.7
According to the latest survey by the Asian Development Bank, Asian parents are spending billions of dollars on private tutors (家庭教师) for their children and the practice is growing despite d
(本小题满分12分) 已知椭圆方程为,P为椭圆上的动点,F1、F2为椭圆的两焦点,当点P不在x轴上时,过F1作∠F1PF2的外角平分线的垂线F1M,垂足为M,当
已知函数是定义在上的偶函数,在上是单调函数,且,则下列不等式中一定成立的是 A. B. C. D.
.Though the NMET is drawing near day by day, I still find I have so much to learn , to revise, to memorize and to analyze but without enough time. Oh, dear, everything seems to be____. A. in a row