若x+y为有理数，且|x+1|+（2x-y+4）2=0，则代数式x5y+xy5=

流式细胞仪

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项

Is there anything more important than health? I don’t think so．“Health is the greatest wealth,” wise people say．    小题1:   ．

If you have a headache, toothache, backache, or bad pain in the stomach, if you complain of a bad cough, or if you suffer from high or low blood pressure, I think you go to the doctor．

The doctor will examine your throat, test your blood pressure, take your temperature, sound your heart and lungs, check your teeth or have your chest X-rayed．____小题2:______．The only thing you have to do is to follow his advice．_____小题3:______．

An old gentleman came to see the doctor．The man was very ill．He told the doctor about his weakness, memory loss and serious problems with his heart and lungs．The doctor examined him and said there was no medicine for his disease．He told his patient to go to a quiet place for a month and have a good rest．__小题4:____．In other words, the doctor advised him to follow the rule: “Eat at pleasure, drink with measure and enjoy life as it is．” The doctor also said that if the man wanted to be well again, he shouldn’t smoke more than one cigarette a day．

A month later the gentleman came into the doctor’s office．___小题5:____．He thanked the doctor and said that he had never felt a healthier man．

“But you know, doctor,” he said, “it’s not easy to begin smoking at my age”

A．He also advised him to eat a lot of meat, drink two glasses of red wine every day and take long walks．

B．You can’t be good at your studies or work well when you are ill．

C．After that he will advise some treatment or some medicine．

D．All these will cost a lot of money．E．He looked cheerful and happy．

F．He was more worried about his illness．

G．Speaking about doctor’s advice, I can’t help telling you a funny story．

小明同学为探究二氧化碳的性质，设计了下列实验．

（1）装置A中的实验现象是______，说明CO₂具有的性质是______．

（2）装置B中倒入适量澄清的石灰水后，迅速拧紧软塑料瓶的瓶盖并振荡，实验现象是______，瓶内发生反应的化学方程式是______．

（3）取一朵用石蕊溶液染成紫色的干燥小花，将小花的一半用水喷湿，放入装置C中，可观察到的实验现象是______，此现象说明CO₂具有的化学性质是______．

（4）小明在查阅资料时发现镁条能在CO₂中燃烧，他在装置D中进行实验，发现镁条剧烈燃烧，发出白光，放热，产生一种白色固体和一种黑色固体，该反应中生成的白色固体是______．这个实验使你对燃烧条件产生的新认识是______．

湿式自动喷水灭火系统，一个报警阀控制的喷头数不宜大于（）。

A.200个

B.500个

C.800个

D.1000个

目前岩层地下工程施工的主要手段是( )。

A．锚固技术
B．支挡技术
C．衬砌技术
D．爆破技术