皮皮学，免费搜题
登录
搜题
【简答题】
(6分）实验室用下图所示装置的部分或全部组合后完成如下实验，请回答下列问题： （1）小明要证明鸡蛋壳的主要成分是碳酸盐，他将A装置中的导气管a与C装置中的导气管 相连，当装置C中产生 的现象达到实验目的。 （2）若将A装置中的药品换成稀硫酸和锌粒，产生的H 2 经干燥后用D装置收集，当D装置的瓶口向下时，导管口的连接顺序应是a→b→c→ 。 （3）B装置中使用过的浓硫酸稀释后，还可以用作它用， 用烧杯稀释浓硫酸时，向烧杯中倒入的物质是 。 （4）判断A装置产生的气体的水溶液显酸性的试液或用品是 。 ①酚酞试液          ②石蕊试液         ③ pH试纸    ④以上三者均可
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】Christianity has become a worldwide religion since it()almost two thousand years ago.
A.
has begun
B.
had begun
C.
began
D.
begins
查看完整题目与答案
【单选题】Since the Iraq war, many an American has come to realize that it is almost impossible for him or her to strike it rich no matter how hard he or she works.
A.
Y
B.
N
C.
NG
查看完整题目与答案
【简答题】阅读理解。 Danny was just tired about the way things were going. His mum came to school and talked on and on about Rick Jackson. It seemed that she would never stop talking. 'Somebody's got to stop that bo...
查看完整题目与答案
【判断题】山西古建筑遗存极为丰富,其中仅古戏台尚遗存了2000多座。其中年代最久远的是一座金大定二十三年(1183)遗留的金代戏台。这座戏台是高平二郎庙戏台
A.
正确
B.
错误
查看完整题目与答案
【单选题】【C2】
A.
for
B.
at
C.
in
D.
since
查看完整题目与答案
【单选题】Since 1999, the number of foreign students at German universities ______ from 113,000 to almost 200,000. [     ]
A.
has increased
B.
have increased
C.
are increased
D.
was increased
查看完整题目与答案
【单选题】He will get everything ready ______ three days.
A.
after
B.
for
C.
in
D.
since
查看完整题目与答案
【单选题】My uncle went to Australia last year. We haven't seen him ______. [     ]
A.
since almost a year
B.
from almost a year on
C.
after almost a year
D.
since almost a year ago
查看完整题目与答案
【单选题】Almost since the beginning of mankind, governments have been recording the numbers of their populace. The first known census report took place in 3800 B. C. in Babylonia for the purpose of deciding wh...
A.
1085
B.
1200 B.C.
C.
3800 B.C.
D.
1790
查看完整题目与答案
【单选题】Since then the population of London________by almost 50,000 a year—an increase largely fuelled by immigration.
A.
has risen
B.
have risen
C.
rises
D.
rise
查看完整题目与答案
相关题目：
【单选题】Christianity has become a worldwide religion since it()almost two thousand years ago.
A.
has begun
B.
had begun
C.
began
D.
begins
查看完整题目与答案
【单选题】Since the Iraq war, many an American has come to realize that it is almost impossible for him or her to strike it rich no matter how hard he or she works.
A.
Y
B.
N
C.
NG
查看完整题目与答案
【简答题】阅读理解。 Danny was just tired about the way things were going. His mum came to school and talked on and on about Rick Jackson. It seemed that she would never stop talking. 'Somebody's got to stop that bo...
查看完整题目与答案
【判断题】山西古建筑遗存极为丰富,其中仅古戏台尚遗存了2000多座。其中年代最久远的是一座金大定二十三年(1183)遗留的金代戏台。这座戏台是高平二郎庙戏台
A.
正确
B.
错误
查看完整题目与答案
【单选题】【C2】
A.
for
B.
at
C.
in
D.
since
查看完整题目与答案
【单选题】Since 1999, the number of foreign students at German universities ______ from 113,000 to almost 200,000. [     ]
A.
has increased
B.
have increased
C.
are increased
D.
was increased
查看完整题目与答案
【单选题】He will get everything ready ______ three days.
A.
after
B.
for
C.
in
D.
since
查看完整题目与答案
【单选题】My uncle went to Australia last year. We haven't seen him ______. [     ]
A.
since almost a year
B.
from almost a year on
C.
after almost a year
D.
since almost a year ago
查看完整题目与答案
【单选题】Almost since the beginning of mankind, governments have been recording the numbers of their populace. The first known census report took place in 3800 B. C. in Babylonia for the purpose of deciding wh...
A.
1085
B.
1200 B.C.
C.
3800 B.C.
D.
1790
查看完整题目与答案
【单选题】Since then the population of London________by almost 50,000 a year—an increase largely fuelled by immigration.
A.
has risen
B.
have risen
C.
rises
D.
rise
查看完整题目与答案