hs, D, six months\r12. The strength grade of masonry mortar meets the design\rrequirements.\rA, must B, appropriate C, should\r13 0 reinforced concrete structure, prestressed concrete\rstructure, () use chloride containing cement.\rA, strictly forbid B, can C, appropriate D, unfavorable\r14, for the span of not less than (3/1000) of cast-in-place\rreinforced concrete beam and slab, its formwork should be\rdesigned according to the requirements of the arch; when the\rdesign has no specific requirements, the arch height should be\rthe span of 1/1000 ~ &\rA, 3M, B, 4m, C, 5m, D, 6M\r15, before the strength of the soil reaches (), do not trample\ror install the formwork and support on it.\rA 1. 2N/mm2 B 1. 5 N/mm2 C 1. 8 N/mm2 D 2 N/mm2\r16, el
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