皮皮学,免费搜题
登录
logo - 刷刷题
搜题
【简答题】
(6分)请根据下表回答有关问题[第(2)和(3)小题均用序号填空]: 序号 ① ② ③ ④ 物质 醋酸 生石灰 熟石灰 纯碱 化学式 CH 3 COOH CaO Ca(OH) 2 (1)写出纯碱的化学式: 。 (2)上述四种物质放入相等的水中,所得的溶液中pH最小的是 ;改良酸性土壤的物质是 。 (3)你认为CH 3 COOH(其性质类似于盐酸)可以与表中 物质发生化学反应。 (4)利用表中的物质作反应物(可以加水或与在水中进行),写出制取氢氧化钠的化学方程式: 。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案:
举一反三
【单选题】International football matches always_____better understanding   between countries all over the world. [     ]
A.
benefit from
B.
reach for
C.
make for
D.
have advantage over
【单选题】听力原文:M: Hi, could you tell me where the conference is being held? I've already registered for it. W: In the Convention Hall on the second floor, sir. M: Thanks. Also, do you know when Professor Fergus...
A.
When a meeting will start.
B.
Whether there are enough chairs.
C.
How to go to the second floor.
D.
Where an event is being held.
【简答题】They never _____10_______
【简答题】A theme in new trade theory is that the__________ of trade we observe in the world economy may be the result of economies of scale and ____________ advantages. First-mover advantages are the economic ...
【多选题】2018年无公害农产品认证制度进行了改革,以下属于改革内容的是( )。
A.
产品产地,两证合一
B.
简政放权,审批下放
C.
取消订标,规范用标
D.
尊重习俗,可用别名
【单选题】The result of the new study will help _ get a better understanding on children's TV viewing.
A.
the movie stars C. the advertisers
B.
the children viewers D. the educators
【多选题】2018年无公害农产品认证制度进行了改革,以下属于改革内容的是( )。(多选)
A.
产品产地,两证合一
B.
简政放权,审批下放
C.
取消订标,规范用标
D.
尊重习俗,可用别名
【判断题】(07)喷枪喷嘴处的压力对得到合适的喷雾扇形有明显的影响。
A.
正确
B.
错误
【单选题】下列哪项不是强直性脊柱炎的特点?( )
A.
病因病理与类风湿性关节炎相同
B.
多见于青少年男性
C.
以非对称性的下肢大关节炎为主,极少累及手关节
D.
有家族史
E.
90%以上患者HLA-B27阳性
【单选题】The author suggests that a better understanding of the ancient settlements on the sea bed may ______.
A.
inspire more young people to take up archaeology
B.
modify the attitudes of the British to their country's history
C.
provide confirmation about the dangers of global warming
D.
alter the perception other countries have about Britain
相关题目:
参考解析:
知识点:
题目纠错 0
发布
创建自己的小题库 - 刷刷题