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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【多选题】黄土湿陷系数试验时垂直压力应符合一定要求，下述正确的是 。
A.
基底压力应在200～300 kPa之间选定
B.
测定黄土湿陷系数时，地面下11.5 m以内的土层使用200 kPa为垂直压力
C.
一般建筑物自基底起10 m以下至非湿陷性黄土顶面应用其上覆土的饱和自重压力，当饱和自重压力大于300 kPa时，仍用300 kPa
D.
基底压力大于300 kPa的桥梁湿陷系数测定时，宜用实际压力
【单选题】To use it seems so natural to put up an umbrella to keep the water off when it rains. But actually the umbrella was not invented as protection against rain. Its first use was as a shade against the su...
A.
No one exactly knows who the inventor of the umbrella was.
B.
The umbrella was first invented to be used as protection against the sun.
C.
The umbrella changed much in the eighteenth century.
D.
In Europe, the Greeks were the first to use the umbrella.