水泵高于吸水池水面的高度不能大于水泵的吸水高度

某颅脑外伤病人，唤之可睁眼，问话能回答，但不正确，刺激肢体时可躲避，此时昏迷评分是()。

A．9分

B．10分

C．11分

D．12分

E．13分

小聪同学家新换了水龙头，从说明书上了解到该水龙头是铜质镀铬．好奇的小聪想探究铬（Cr）与常见金属铁、铜的活动性强弱，邀请你一同参加．

[知识回放]

金属活动性顺序：K  Ca  Na  Mg   Al  Zn　 　Sn  Pb（H）　 　Hg  Ag  Pt  Au，请你在横线上填写对应金属的元素符号．

[作出猜想]

猜想1．Cr＞Fe＞Cu；    猜想2．Fe＞Cu＞Cr；    猜想3．你的猜想是　       　．

[查阅资料]

（1）铬是银白色有光泽的金属，在空气中其表面能生成抗腐蚀的致密的氧化膜．

（2）铬能与稀硫酸反应，生成蓝色的硫酸亚铬（CrSO₄）溶液．

[设计实验]

小聪同学取大小相等的三种金属片，用砂纸打磨光亮；再取三支试管，分别放入等量的同种稀硫酸．

实验	试管1	试管2	试管3
实验 操作
实验 现象	铁片表面产生气泡较慢，溶液变为浅绿色	铬片表面产生气泡较快，溶液变成为蓝色

[结论与解释]

（1）小聪得到的结论是猜想　     　正确．

（2）实验前用砂纸打磨金属片的目的是　                            　．

[知识运用]

将铬片投入FeSO₄溶液中，反应　     　（填“能”或“不能”）进行．若能进行，请你写出反应的化学方程式　                              　．

电报信号、数据信号、遥测指令等都属于（）信号。

A.数字

B.模拟

C.载波

D.调频

B

Escaping a fire is a serious matter: knowing what to do during a fire can save life. It is important to know the way you can use and show them to everyone in the family, such as stairs and fire escapes, but not lifts. From the lower floors of building, escape through windows is possible. Learn the best way of leaving by window with the least chance of serious injury.

The second floor window is usually not very high from the ground. A person of average height, hanging by the fingertips will have a drop of about 6 feet to the ground. It is about the height of an average man. Of course, it is safer to jump a short way than to stay in a burning building.

Windows are also very useful when you are waiting for help. Be sure to keep the door closed before opening the window. Otherwise, smoke and fire may be drawn into the room. Keep your head low at the window to be sure you get enough fresh air rather than smoke that may have leaked into the room.

On a second or third floor, the best windows for escape are those which open onto a roof. From the roof a person can drop to the ground more safely. Dropping onto the cement might end in injury. Bushes and grass can help to break a fall.

69. Which of the following people seldom use when trying to escape a fire?

A. Windows.                        B. Doors.                                   C. Fire escapes.             D. Lifts.

70. How far from the ground to the second floor window?

A. About 12 feet.                                                           B. About 3 feet.

C. Nearly 10 feet.                                                           D. About height of an average man.

71. The writer tells us that ______.

breathing in smoke might not be harmful

smoke will enter the room by an open window

fresh air can’t reach the second floor

to keep your head low will help you escape a fire

《公安边防消防警卫部队院校招收士兵学员工作实施细则》规定，部队院校招生工作应当实行回避制度，当年有（）报考的干部，不得参加招生工作。

A.直系亲属

B.旁系亲属

C.三代以内旁系亲属

D.姻亲亲属