单项选择题

#1989年，美国人（），发明了选择性激光烧结技术，该技术的特点是选材范围非常广泛，如尼龙ABS树脂，金属和陶瓷粉末等，都可以作为原材料。
A、C.R.Dechard
B、Charles W. Hull
C、Scottcrown
D、Charles W. keth

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The equation for the Statement of Cash Flows is（）。

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B．Net cash flow from (Operating Activities – Investing Activities – Financing Activities) + Beginning Cash balance = Ending Cash balance
C．Net cash flow from (Operating Activities + Investing Activities + Financing Activities) – Beginning Cash balance = Ending Cash balance
D．Net cash flow from (Operating Activities – Investing Activities + Financing Activities) + Ending Cash balance = Beginning Cash balance

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