单项选择题
A.10mm B.20mm C.30mm D.40mm
A.50~100mm B.10~50mm C.100~150mm D.150~200mm
A.30cm B.40cm C.50cm D.60cm
A.自然养护 B.浇水养护 C.蒸汽养护 D.蓄水养护
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