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民用建筑物的耐火等级分为几个等级？( )

A.三级
B.四级
C.五级
D.六级
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单项选择题
通用实验室标准单元的开间是由实验台的宽度、布置方式及间距决定的，实验台平行布置的标准单元，其开间不宜小于下列哪项？( )
A.7.50m
B.7.20m
C.6.60m
D.6.00m
单项选择题
破伤风痉挛毒素能阻止抑制性神经递质的释放。（ ）
A．对
B．错
单项选择题
Once a month, just after sunset, trucks fill an outdoor parking lot in Los Angeles, California．Some trucks sell all kinds of food. Others have clothing for sale. These are known as fashion（时尚）trucks.
It's really fun to go through everything in the truck. The back of the truck is a small store. Clothing hangs on one side. Jewelry（首饰）and purses are on the other. The store looks colorful and is well organized. There is also a very small room for trying on clothes.
Jordana Fortaleza is one of the truck owners. She says the cost of owning a truck is much lower than paying for a store. And there is another reason to use a truck. You can take your business to your customers. But there are also difficulties.
The biggest problem is the weather. In winter, it's cold outside and there's no one around. Another problem is keeping the truck in good condition. When it breaks down, the repairs can take days. Business stops during the time. It happens at least once a year because her truck is 38 years old．
Meagan Rogers is a fashion school graduate. She says the job market is so hard now, but with a fashion truck she's able to start earning money while her classmates are still working without pay.
What do we know about Meagan Rogers?（　　）
A.Shehasstartedmakingmoney
B.Shehasn'tfinishedherschool
C.Sheishappytohelpherclassmates
D.Shehasproblemswithhertruck
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