论文部分内容阅读
1.II式四耳罐 2.两耳罐------------------------------------------------------------------—--—.------..-.--..............._一L,........................................................................。..。...................。.........................J 3.I
1.II type four ear cans 2. two cans -------------------------------------- --------------------------------. ------ ..-. - ..... .........._ a L, .................................... ..................................... ... .................... ......................... J 3.I