发布时间:2025-01-31 12:05:22
这个要看你营养土的成分,正常营养土和黄沙比例为1:1,黄沙主要增加过水性,防止水肥过大引起烂根,营养土如果泥炭土、椰糠等成分过大则要增加黄沙的比例
大礼堂内的墙为什么都要建成凹凸不平状是为了减少回音还是增加回音呢
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