问题
单项选择题
采用四点起吊匀质细长杆件时，两端吊点的位置拟在距离起吊端的（）L（L为杆的长度），中间吊点距离为0.27L。
A.0.1
B.0.095
C.0.085
D.0.075
答案
参考答案：B
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采用四点起吊匀质细长杆件时，两端吊点的位置拟在距离起吊端的（）L（L为杆的长度），中间吊点距离为0.27L。
A.0.1
B.0.095
C.0.085
D.0.075
参考答案：B
| 完形填空。 | ||||
| Fire can help people in many ways. But it can also be very harmful (有害的). Fire can keep your house 1 , give light and cook food. But fire can burn things 2 . Big fire can burn, trees, houses, animals or people. Nobody knows how people began to use fire. But there are 3 interesting old stories about how a man or woman started a fire. One is 4 a man. The man 5 a very long time ago. He went up the sun and 6 fire down. Today people know how to make a fire with matches(火柴). Children sometimes 7 to play with them. But matches can be very dangerous. One match can burn a piece of paper. and 8 it could burn a house. A small fire can turn a big fire very quickly. So you 9 be careful with matches. Be careful with fire, and it will 10 you. But if you aren't careful with fire and it may hurt you. | ||||
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