單項(xiàng)選擇題對(duì)水泥凝固時(shí)間的要求是()

A.初凝時(shí)間長(zhǎng),終凝時(shí)間短
B.初凝時(shí)間短,終凝時(shí)間長(zhǎng)
C.初凝時(shí)間、終凝時(shí)間均短
D.初凝時(shí)間、終凝時(shí)間均長(zhǎng)


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