In the early 21st century, the Internet world quietly emerged an online Festival - Online Valentine's day, which was spontaneously organized by hundreds of millions of Internet users. This is the first fixed festival in the virtual network world, which is set on May 20 and May 21 every year, because
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2022-04
The corrugated board and honeycomb board with the same face paper and core paper, the same amount of paper and the same adhesive between the core layer and face paper are tested for performance. The test data are shown in Table 1.Standardization specified by data:(1) The flat pressing strength of ho
