The control project that medium heating furnace system under the control of PLC is possible, then we have making a comparison cost performance between several model of PLC.

用PLC实现热媒炉系统的控制是一种可行方案，通过这种方案看几种型号PLC的性能价格比。

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Data structures must be under strict change control, so that the various business and system implications of any change can be properly managed.

数据结构必须在严格的变更控制下，以便于可以适当地管理各种业务和系统牵连的变更。

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You can compute coverage for parts of the system under test and test components to provide better control of the test results.

您可以计算测试和测试组件下的系统部分的覆盖范围，以对测试结果有更好的控制。

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Collectivism is the system of ownership and control of the means of production by the people collectively, usually under the supervision of a government.

VOA: special.2010.06.06

NYPD, the schools system is not under the control of the mayor.

ECONOMIST: New York's mayor

We have moved from a U.S. capability that is extent and will continue to exist, to one that is now -- can be made available to NATO and operate under NATO rules of engagement, NATO agreements on how the command-and-control system is supposed to operate, and formally, under the operational control of a NATO commander as opposed to a U.S. commander.

WHITEHOUSE: Press Briefing on NATO Defense Capabilities

The very core of Mr Kohl's attempt to rejuvenate the economy a drastic overhaul of the tax system has finally crumbled under pressure from the Social Democrats, who control the second chamber of parliament, the Bundesrat.

ECONOMIST: Drowning in troubles