非质子性溶剂应选择的溶剂为()。
A.纯水
B.液氨
C.冰醋酸
D.甲苯
E.甲醇
参考答案:D
解析:
非水溶液滴定法
化简:
(1)(2x-y+z-2c+m)(m+y-2x-2c-z);
(2)(a+3b)(a2-3ab+9b2)-(a-3b)(a2+3ab+9b2);
(3)(x+y)2(y+z-x)(z+x-y)+(x-y)2(x+y+z)(x+y-z).
—What's your favorite subject?
—Among all these subjects, I like English .[ ]
A. well
B. good
C. better
D. best