皮皮学,免费搜题
登录
搜题
【多选题】
关于下列各图的叙述正确的是
A.
图①表示A、B两物质的溶解度随温度变化情况,将A、B饱和溶液分别由t 1 ℃升温至t 2 ℃时,溶质的质量分数B>A
B.
图②表示常温下,稀释HA、HB两种酸的稀溶液时,溶液pH随加水量的变化,则同浓度的NaA溶液的pH 小于NaB溶液
C.
图③可表示乙酸溶液中通入氨气至过量过程中溶液导电性的变化
D.
根据图④,若除去CuSO 4 溶液中的Fe 3+ 可采用向溶液中加入适量CuO,至pH在4左右
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
【单选题】. --- Mr Smith, __________ girl wants to see you. --- If that’s __________ girl who has fair hair and wears a red dress, I want to see her.
A.
a; a
B.
a; the
C.
the; a
D.
a; /
【简答题】估算。 19×39≈ 31×21≈ 42×59≈ 13×28≈ 48×29≈ 51×51≈
【单选题】3, 10, 21, 35, 51, ( )
A.
59
B.
66
C.
68
D.
72
【单选题】—What does your uncle do? —_____. [     ]
A.
He is Mr Green
B.
He is from Japan
C.
He often plays tennis after school
D.
He is a worker
【单选题】10,21,35,51,( )
A.
59
B.
66
C.
68
D.
72
【简答题】直接写得数. 51÷3= 990-99= 26×4= 59+41= 990÷11= 90÷6= 95÷5= 480÷8= 300-157= 3×43= 45万+67万= 9×8÷9×8=
【简答题】估算 74×22≈ 51×68≈ 59×92≈ 298+205≈ 432-228≈ 82÷8≈ 38×53≈ 77÷4≈
【简答题】47×67+35 2 -51×59+0.0 . 7 +14.9 . 2 =______.
【简答题】比较大小。 34+5○5+34                  59-5○51+5 88-8○99-9                    24+3○28-3
【单选题】Big cites today are confronted with very serious problems. Transport is a【C1】______difficulty: some planners believe in【C2】______transport system;others believe in making it possible for citizens to m...
A.
minor
B.
major
C.
little
D.
small
相关题目: