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Regarding the technical requirements for the amount of masonry materials for water supply and drainage structures, the error is that the strength grade of ()A. mechanism sintered bricks is generally not lower than MU10B. When there is no requirement for design, the stone strength grade

author：Two build fighting

Regarding the technical requirements for masonry materials for water supply and drainage structures, the error is ()

　　A. The strength grade of mechanism sintered bricks is generally not lower than MU10

　　B. When there is no requirement for design, the strength grade of stone shall not be less than 20MPa

　　C. Concrete blocks should comply with design requirements and relevant regulations

　　D. The strength of cement mortar should not be lower than M10

concerning cement devise mistake Less than
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