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

Under a private system, the link between price deviation and correction is immediate and strong because supply is under the direct control of the currency issuers, who have the means through loan and trading operations to tightly clamp down on (or expand) the supply.

FORBES: Private Currency Competition Is The Monetary Answer