【简答题】正常情况下,人体内环境的成分和理化性质能够维持相对稳定,这是机体进行正常生命活动的必要条件。而近年来,温室效应造成全球气候异常引起的自然灾害越发频繁,广州市等我省很多城市每到秋冬季节还经常出现灰霾天气。灰霾中的亚微米粒子会沉积于呼吸道和肺泡中,引起支气管炎等病症。请分析回答相关问题:血浆是内环境的主要组成部分,血浆渗透压的大小主要与血浆中的()含量有关。
【简答题】(2013江苏扬州)科学家设想利用太阳能加热器“捕捉CO 2 ”、“释放CO 2 ”,实现碳循环。 (1)步骤1的化学方程式为 。 (2)为确定步骤2中的碳酸钙是否完全分解,设计的实验步骤为:取少量固体于试管中,滴加过量 溶液,若观察到试管内 ,则分解不完全。 (3)上述设想的优点有 (填字母序号)。 a.原料易得且可循环利用 b.充分利用太阳能 c.可全地域全天候使用 (4)CO 2 是宝贵的碳...
【简答题】科学家设想利用太阳能加热器“捕捉CO 2 ”、“释放CO 2 ”,实现碳循环. (1)步骤1的化学方程式为 . (2)为确定步骤2中的碳酸钙是否完全分解,设计的实验步骤为:取少量固体于试管中,滴加过量 溶液,若观察到试管内 .则分解不完全. (3)上述设想的优点有 (填字母序号). A.原料易得且可循环利用 B.充分利用太阳能 C.可全地域全天候使用 (4)CO 2 是宝贵的碳氧资源...
【单选题】George Orwell is mentioned in the passage because ______.
A.
he was the one who coined the expression 'Big Brother'
B.
he was a famous British novelist in the 20th century
C.
he described a world where individual privacy is denied
D.
he conducted the investigation of the damage done to individual privacy
【简答题】(14分) X、Y、Z、W是元素周期表中前四周期四种常见的元素。已知:W基态原子有7个轨道填充了电子;Y与Z原子最外层的电子数相同,但Y的原子半径比Z小;ZY 2 和Y 3 都具有漂白性,它们分子的空间构型都是V型;X的合金在生活中有非常广泛的用途,X分别与Y、Z形成化合物甲、乙,在甲、乙中X的质量分数分别为72.4%和63.%;丙是由X、Y、Z三种元素组成的一种常见的还原剂,在溶液中反应1个...
【单选题】Which of the following points is NOT included in the passage?
A.
One of the major tasks of education is to discover the most promising students.
B.
In order to teach effectively, educators are requested to lay emphasis on one particular field.
C.
Some subjects have been over-emphasized in public schools.
D.
The progress Of the society can not merely rely on inventors.
【单选题】Which of the following points is NOT INCLUDED.in the passage?
A.
One of the major tasks of education is to discover the most promising students.
B.
In order to teach effectively, educators are requested to lay emphasis on one particular field.
C.
Some subjects have been over-emphasized in public schools.
D.
The progress of the society cannot merely rely on inventors.