本文件的目的是提供一般信息并引起討論。它不打算作為一個參考，指導(dǎo)或建議用于貿(mào)易，投資，或其他商業(yè)活動。作者和加拿大自然資源公司不對內(nèi)容作出任何保證，不承擔(dān)因使用本文件而產(chǎn)生的任何附帶的、后果性的、財(cái)務(wù)上的或其他方面的責(zé)任。

The intent of this document is to provide general information and to elicit discussion. It is not intended as a reference, guide or suggestion to be used in trading, investment, or other commercial activities. The author and Natural Resources Canada make no warranty of any kind with respect to the content and accept no liability, either incidental, consequential, financial or otherwise, arising from the use of this document.