皮皮学，免费搜题
登录
搜题
【单选题】
25℃时，等体积的 ① pH＝2 H 2 SO 4 溶液 ②0.005mol/L Ba(OH) 2 溶液 ③pH＝10 Na 2 CO 3 溶液④pH＝4 NH 4 Cl溶液中，发生电离的水的物质的量之比是A.
1:1:10 8 :10 8
B.
10 8 :10 8 :1:10 6
C.
10 8 : 5×10 7 :1:10 6
D.
1:2:10 8 :10 8
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】A．Sending more American students to other countries to study their language. B．Hiring more foreign language teaching assistants in American schools. C．Starting earlier foreign language teaching in Ame...
【简答题】In the 17th century letters were carried from Britain to European countries by sailing______.
【单选题】Newspaper is one of ______ means of sending news and information.
A.
common
B.
more common
C.
the commonest
D.
the most common
【单选题】Many farmers in rich countries moved to cities in the 19th century because of ______ .
A.
a scarcity of farm jobs
B.
the hope of better jobs and life
C.
discriminating economic policies
D.
both A and B
【单选题】Sending man into ______ space is not _____dream for human beings any longer.
A.
/; a
B.
the; a
C.
the; the
D.
/; the
相关题目：