配制pH≈7的缓冲溶液，应选择( )
A:
B:
C:
D:
A:
B:
C:
D:
举一反三
- 下列混合溶液，属于缓冲溶液的是( ) A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/413dde4a50bc4879b3f05933c4333509.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/c18a15cd6f73457a9599b67d38591f3a.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/3a623242f78047598682322d44b59454.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/e85a62f542f34bcc80e9ee664fec7caa.png" />
- 以下哪个不是波兰国旗？（） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/3e56534d2a9245bd96ae3e551321035e.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/f5112a85457e41f5a909e00dc9d3043a.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/7c21067303c044f98a841c4f5f4b8d61.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/0ede615d89834d17bde3b47b2acbf0d6.png">
- 下列离子属于9~17电子构型的是( )。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/98d5d4b38f664003989388c34b412dae.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/5d447bd56a6a4e5c899da3611c5592c3.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/c34f43d2aa684eac93ea994d37780085.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/0048373ac18e4dbebaeb3ad4687aacb3.png" />
- 下列电子分布属于激发态的是( )。 A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/81ae45d9bae64d52b1536457514518b5.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/63d505d34b5d439f8106b60f8c554f13.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/1acc5dd06db846b0b4d24bb7da1222db.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/48001e23a0004fd0abda873af7d8e943.png" />
- 下列有关权及其单位权的说法错误的是（） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/3b610343e75041a5b85fa9759bb6c34f.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/14a2c2de37654395a5091690389dc05b.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/066e4db2d5224650a64891160cc8feb4.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/202007/483474eb34d84fa2b9bb41998d4a680d.png">