女性，50岁。为慢性阻塞性肺疾病(COPD)支气管炎型患者，近1周受凉后咳嗽、气急加

（8分）无色溶液X由Na⁺、Ag⁺、Ba²⁺、Al³⁺、AlO₂^-、MnO₄^-、CO₃^2-、SO₄^2-中的若干种离子组成，取溶液进行如下连续实验：

（1）气体A的成分是（填化学式，下同）              ，气体B的成分是：            

（2）溶液中一定存在的离子有：                   。

可能存在的离子有：                         。

某人从楼顶由静止释放一颗石子，如果忽略空气对石子的阻力，利用下面的哪些已知量可以测量这栋楼房的高度H（重力加速度g已知）

A．石子落地时的速度

B．石子下落的时间

C．石子下落最初1s内的平均速度

D．石子下落最后1s内的位移

《通典》是中国历史上第一部体例完备的政书。( )

某工厂的工业废水中含有大量的FeSO4、较多的Cu2+和少量的Na+。为了减少污染并变废为宝，工厂计划从该废水中回收硫酸亚铁和金属铜。请根据流程图，在下方的括号内填写物质名称(或主要成分的化学式)或操作方法，完成回收硫酸亚铁和铜的简单实验方案。      

并写出有关离子方程式

  Microwaves may be great at warming up food, but what about warming people?

Using microwaves to directly heat owners of a room would save much of the energy wasted by heating walls and furniture. And despite popular ideas about microwaves, this technique would be safe, according to Charles R. Buffler of the Microwave Research Center in Marlborough, New Hampshire. Low-power microwaves only penetrate (贯穿) the skin (low-power microwave penetration in a ham is about 0.2 inches, for example) and with no negative effects.

To test this idea, Buffler subjected himself to microwaves in a special room using a standard 500-watt, 2459 MHz magnetron (磁控管). He found that a person will start to feel warmth at about 20 milliwatts per square centimeter (mw. /sq.cm.); a satisfactory feeling of warmth occurs between 35 and 50 mw./sq.cm. By comparison, a person standing in noonday summer sun feels the amount of 85 mw./sq.cm. And a frozen meat pie in your microwave oven receives about 1000 mw./sq. cm.

In houses of the future, each room could be provided with its own magnetron, says Buffler. When you stepped into the living room, for example, a motion detector would turn on the magnetron, filling the room with low-power microwaves. In the same way that a microwaves oven heats up a hamburger, but not the plate it’s on, you would feel warmth from the microwaves without changing the temperature of your coffee table. (You could, however, make your favorite easy chair even more comfortable by treating it with a radiation-absorbing chemical.)

While it might be some time before homeowners are comfortable enough with the idea to set up whole body microwave heaters in houses, Buffler says microwaves may attract livestock farmers. Lambs that are born outdoors in winter, for example, are frequently lost to cold. Microwaves could warm the lambs safely and quickly.

小题1: Which of the following can tell the main idea of the passage?

A．A new heating system.

B．A new microwave oven.

C．A popular technique.

D．The magnetron.小题2: The test conducted by Buffler shows that when a person feels comfortable warmth, he receives about ____.

A．20 mw. / sq. cm.

B．40 mw. / sq. cm.

C．60 mw. / sq. cm.

D．85 mw. / sq. cm.小题3: According to paragraph 4, which of the following fills the room with low-power microwaves?

A．The magnetron.

B．The motion detector.

C．The microwave oven.

D．The radiation-absorbing chemical.小题4: Which of the following statements about microwave heaters would Buffler most probably agree with?

A．Microwave heaters will soon be widely used by homeowners.

B．Microwave heaters sometimes make people feel uncomfortable.

C．Microwave heaters will be probably first used by livestock farmers to protect their lambs in winter.

D．Microwave heaters cannot be accepted by the public because they are somewhat unsafe.