原油的初馏塔模拟

孤狼小黑

  **  ERROR IN THE "ASSAY" PARAGRAPH WHICH BEGINS ON LINE 59
      ASSAY NAME: YOUPIN     SKW: IN-UNITS     TKW: PDROP
      "?" IS AN INVALID UNIT NAME FOR
      PROPERTY TYPE: "PDROP".  THE DEFAULT UNITS:
      "N/SQM" WILL BE USED.

  **  ERROR IN THE "PC-CALC" PARAGRAPH WHICH BEGINS ON LINE 50
       SKW: IN-UNITS     TKW: PDROP
      "?" IS AN INVALID UNIT NAME FOR
      PROPERTY TYPE: "PDROP".  THE DEFAULT UNITS:
      "N/SQM" WILL BE USED.

! Errors while processing input specifications

这个怎么解决啊