50*50
ä¸éé¢ç®¡ååº¦æ ¹æ®æ¹é¢ç®¡çç¨éä¸å,éç¨ä¸¤ä¸ªä¸åçå½å®¶æ å,åå«æ¯GB/T6728-2002ç»æç¨å·å¼¯ç©ºå¿åé¢åGB/T3094-2000 å·æå¼åé¢ç®¡.
åè
50*50æ¹é¢çå£ååå«ä¸º1.5ã1.75ã2.0ã2.5ã3.0ã4.0,å
许å差为±0.50.
åè
50*50æ¹é¢çå£ååå«ä¸º4ã5ã6ã7ã8,å
许å差为å£åç±10%.