... predetermined overhead rate预计制造费用分配率 actual machine hours 实际机器运转小时 numerator denominator 分子分母 ...
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actual machine hours
实际机器小时数
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In my tests on both machines, the actual installation took about two hours, but a full workday or more was spent tweaking each machine, and getting updates to Windows 8 and its built-in apps.
WSJ: A Review of Windows 8 Upgrade: Not for Old-at-Heart PCs
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