皮皮学，免费搜题
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搜题
【单选题】
下列哪种方法,适用于较完整的、裂隙发育程度较轻、充填物情况不严重的岩层A.
单孔冲洗
B.
高压冲洗
C.
高压脉动冲洗
D.
扬水冲洗
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皮皮学刷刷变学霸
举一反三
【单选题】What is the most important feature of the backpack invented by Lawrence C. Rome and his colleagues?
A.
It produces electricity for electronic devisees while the wearer walks.
B.
It can be used as cell phones, GPS in the military actions or field studies.
C.
It is small and convenient.
D.
It is light and easy to carry.