发布时间:2025-01-30 18:37:19
水彩(粉)颜料、报纸裁条、浆糊、水,板涮(羊毛的),画板。
先将画板打湿,然后在将素描纸铺上,边用水打湿变用板涮把纸擀平;待纸浸透后切纸张下无气泡时。用已上过浆糊的报纸条把纸固定在画板上。待干后,上色,也可逞湿上色,颜色一定要不稠不烯。干后用刀沿四周裁下。这样纸张就可以平平整整画素描了
金属管浮子流量计和涡街流量计的区别在哪里是不是金属管浮子是机械式的涡街是电子式仪表呢
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