henols are compounds that have a hydroxyl group bonded directly to benzene or benzenoid ring. The parent compound of this group, C6H,OH, called simply phe- nol, is an important industrial chemical. Many of the properties of phenols are anal- ogous to those of alcohols, but this similarity is something of an oversimplification.Like arylamine

复化求积法的基本思想: 将积分区间[a,bn等分,可得到n+1个求积 节点:Xk=a+kh,(k=0,1,n),其中h=b-a

20.1 () Carboxylic aci id anhydrides bear two acyl groups on oxygen, as in RCOCR. They are named as derivatives of carboxylic acids. Q CH:CH2CHCOH CH,CH,CHCOCCHCH_CH3 C6H C. C. 2-Phenylbutanoic acid 2-Phenylbutanoic anhydride (c) Butyl 2-phenylbutanoate is the butyl ester of 2-phenylbutanoic acid. CH,CH,CHCOCH,CH,CH2CH

15-1频率为v=1.25×104H的平面简谐纵波沿细长的金属棒传播,棒 的弹性模量为E=1.90×10N·m2,棒的密度p=7.6×103kgm-3.求该纵 波的波长

3.同温度、同物质的量的H2和He两种气体,它们的() A、分子的平均动能相等; B、分子的平均平动动能相等; C、总动能相等; D、内能相等

一、结构中常用的梁、板是典型的受弯构件 二、梁的截面形式常见的有矩形、T形、工形、箱形、Ⅱ形 三、现浇单向板为矩形截面,高度h取板厚,宽度b取单位宽度(b=1000mm)

一、概述 1、概念:构成生物体的元素,已知有五十多种,除去C、H、O、N四种构成水分和有机物质的元素外,其它元素统称为矿物质。 2、功能 (1)是构成生物体的组成部分

一、公式的导出 设将[abn等分,步长为h,求积节点为:xk=a+kh,(k=0,1,,n)由此构造插值型的求积公式,则其求积系数为

一、选择题(请选择正确答案的英文字母代码,每题至少有一个正确答案13分) ()1.已知0.10mol.l-1fec3溶液的hJ1.6,与Fe(H20)63+的酸电离常数据最接近的数据是: A.5×10-2B.7×10-3C.5×10-4.8×10-4

一、填空(20分) 1.热力学第一定律可以写成△U=Q-W和△U=Q+W,产生这种差别的原因是对于有理想气体参与的化学反应,则△H△U(填“>”、“=”或“<