关于锅炉底部排污下列说法中错误的是（）。A．应在投放除垢药后过相当长时间进行 B．各

阅读再判断正误。

It’s 5:30 in the afternoon. School is over. It’s time for student to relax.

Look! Some boys are playing soccer and some are playing basketball on the playground(操场). Most girls don’t like ball games because they think they are boring. They like to do other sports, such as swimming and dancing. Look, some girls are swimming in a big swimming pool. In the gym(健身馆), Maria and her friends are dancing to the music. Some students are singing together in the classroom building. Who are they? Oh, they are some students of Class Four. They are cleaning their classroom now. After that, they can play with other students.

根据上面内容判断正误，正确的写T， 错误的写F。

小题1: After 5:30pm, the students don’t have classes.

小题2: On the playground, some boys are playing basketball and soccer.

小题3:We can’t see any students swimming in the pool now.

小题4: Some students from Class Four are singing together in the classroom.

小题5: Maria is dancing on the playground.

[2012·广东肇庆市一模]（14分）I：某兴趣小组欲在绿色环保的条件下探究大气污染物SO₂的性质，设计如下图实验装置。请回答：

（1）B、C、D分别用于检验SO₂的漂白性、还原性和氧化性，则B中所盛试剂为        ；

C中反应的离子方程式为                             。

（2）为了实现绿色环保的目标，某同学设计了上图A₂的制取装置来代替A₁装置，与A₁装置相比，A₂装置的优点是                                    （写两点）。

II：用氨水吸收尾气中的SO₂，“吸收液”中可能含有OH^-、SO₃^2-、SO₄^2-、HSO₃^-等阴离子。请回答：

（3）氨水吸收过量SO₂的反应的离子方程式为                             。

（4）已知亚硫酸氢盐一般易溶于水，SO₂也易溶于水。现有仪器和试剂为：小烧杯、试管、玻璃棒、胶头滴管、过滤装置和滤纸；2 mol/L盐酸、2 mol/LHNO₃、1 mol/LBaCl₂溶液、l mol/LBa(OH)₂溶液、品红溶液、蒸馏水。请设计实验证明“吸收液”中存在SO₃^2-、HSO₃^-，完成下表的实验操作、预期现象和结论：

男性，29岁。刺激性咳嗽1个月，头痛1Od。X线胸片显示左肺门块状阴影；颅脑CT发现颅内占位性病变。考虑肺癌脑转移，肺内原发癌最可能的病理类型是（）

A.鳞癌

B.腺癌

C.小细胞癌

D.大细胞癌

E.细支气管肺泡癌

盾构掘进过程中，必须确保开挖面的稳定，必须按（）调整土仓压力（泥浆压力、泥浆性质）和控制出碴量（泥水量）。

A.掘进参数

B.进度要求

C.围岩条件

D.统计值

阿玛耳忒亚(Amalthea)