锡焊时，要（）选定一定功率的电烙铁或烙铁。 A.按焊接件大小 B.按焊接件材料 C.

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You must hear about earthquakes，but do you know what to do during and after an earthquake ？Here is some advice for you：
Before an earthquake.It is necessary to prepare yourself and your family.All family members should know how to turn off gas，waterand electricity and know useful telephone numbers（doctor，hospital，police，119，etc）.Never put heavy things over beds..
During the earthquake.It’s important  for each of you to stay calm.If you are indoors ，quickly move to a safe place in the room such as under a strong desk or a strong table.It can protect yourself from falling things.Stay away from windows ，large mirrors，heavy things and so on.If you are cooking，turn off the gas.
If you are outdoors，move to an open area like a playground.Move away from buildings，bridges and trees.If you are driving ，stop the car as soon as possible .Stay in your car.
After an earthquake.Once the shaking stops ，do not run out of the building at once.It’s  better to wait and leave when it is safe.
Check around you and help the people in trouble.If your building is badly broken，you should leave it.If you smell or hear gas ，get someone outside and open windows and doors.If you can do it safely，turn off the gas.Repeat it to the gas company.

Some useful   小题1:  about earthquakes
Before an earthquade	小题2:  yourself and your family. Don’t  小题3: to turn off gas，water and electricity. Remember some useful telephone numbers and not to 小题4: heavy things over beds.
小题5:  an earthquake	小题6:  calm is important for each of you. Moving to a safe place in the room can protect yourself from falling things if you are  小题7:   . Remmember to turn off the gas if you are cooking. Moving to an open area and away from builings is 小题8:  it’s safe. Check around you and help the people in trouble. Leave your badly broken building. Keep everyone outside and everything    小题9:  if you smell or hear a gas .