Friday, September 16, 2022
Friday, September 16, 2022
问题:与大气相连通的自由水面下5m处的相对压强为:()A、5atB、0.5atC、98kPaD、40kPa...
Friday, September 8, 2023
问题:某吸热反应逆反应的活化能是20kJ/mol,正反应的活化能为:(...
Friday, September 16, 2022
问题:在氨水中加入一些NH<sub>4</sub>Cl晶体,会使()。...
Friday, September 16, 2022
Thursday, September 15, 2022
问题:比较原子半径大小,下列叙述中错误的是()。A、K>NaB、S>PC、Al>SiD、Na>Mg...
Monday, June 19, 2023
Sunday, September 11, 2022
问题:对精度为0.05mm的收敛计进行率定时,反复三次测得的收敛值与率...
Sunday, September 11, 2022
Sunday, September 11, 2022
问题:47号元素Ag的基态价层电子结构为4d<sup>10</sup>...
Friday, September 16, 2022
问题:下列反应能自发进行()2Fe<sup>3}+</sup>+Cu=...
Friday, September 16, 2022
问题:AgCl在某种溶液中的溶解度为9.3×10<sup>-5</su...
Thursday, September 15, 2022
Thursday, September 15, 2022
Friday, September 16, 2022
问题:对于HCl气体溶解于水的过程,下列说法正确的是:()...
Friday, September 16, 2022
问题:水利工程岩石试验的试验内容、试验方法、试验数量由()决定。...
Thursday, September 15, 2022
问题:一般来说,某反应在其他条件一定时,温度升高其反应速率会明显增加,主要原因是:()A、分子碰撞机会增加B、反应物压力增加C、活化分子百分率增加D、反应的活化能降低...
Wednesday, August 2, 2023
问题:在土的基本物理性质试验中,一般采用()测定黏性土的密度。...
Sunday, September 11, 2022
问题:已知CaCO<sub>3</sub>和PbI<sub>2</su...
Friday, September 16, 2022