... paper star 纸星 paper strength tester 纸张强度试验器 paper strengthening agent 纸张增强剂 ...
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paper r strength tester 纸张强度试验器
Paper tear strength tester 纸张撕裂强度试验机
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The scratch strength tester has been improved in the paper, which can measure the impact toughness and has two uses.
对刮痕强度试验机进行适当的改进，就可测量芯砂的冲击韧性，并使一机两用。
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