【单选题】Recently, a team of eight medical experts has arrived in Shanxi Province to help to the latest vaccine incident.
【单选题】下列物质中存在配位键的是( ) ①H 3 O + ②[B(OH) 4 ] - ③CH 3 COO - ④NH 3 ⑤CH 4 .
【单选题】将0.2摩/升CH 3 COOK与0.1摩/升盐酸等体积混和后,溶液中下列微粒的摩尔浓度的关系正确的是( )
A.
[CH 3 COO - ]=[Cl - ]=[H + ]>[CH 3 COOH]
B.
[CH 3 COO - ]=[Cl - ]>[CH 3 COOH]>[H + ]
C.
[CH 3 COO - ]>[Cl - ]>[H + ]>[CH 3 COOH]
D.
[CH 3 COO - ]>[Cl - ]>[CH 3 COOH]>[H + ]
【单选题】CH 3 COOH溶液中存在如下平衡:CH 3 COOH?H + +CH 3 COO - ,加入少量下列固体物质能使平衡向左移动的是( )
【单选题】因果图在进行测试用例设计时重点考虑以下问题: