Sentence examples for systems are necessary from inspiring English sources
What types of phone systems are necessary?
Do you believe such missile defense systems are necessary as many global powers work toward disarmament?
Emergency power systems are necessary so that detectors, circulating pumps, valves, and other critical components continue to operate as necessary to remove decay heat.
In engines with continuous combustion, such as gas turbines and liquid-fueled rockets, which have no pistons to create a pumping action, fuel-injection systems are necessary.
No one knows which aspects of living systems are necessary, in the sense that living systems everywhere must have them, and which are contingent, in the sense that they are the result of evolutionary accidents such that elsewhere a different sequence of events might have led to different properties of life.
In addition, combined exhaust gas aftertreatment systems are necessary.
However, energy and economic evaluation under similar assumptions of extraction-based separation systems are necessary.
Practical tsunami early warning systems are necessary for mitigating disasters caused by such great tsunamis.
Computer simulation and analysis of power systems are necessary for both planning and operation.
New sensitizer or semiconductor systems are necessary to broaden the photo-response in solar spectrum.
New battery structures and nano energy systems are necessary to enhance the performance of batteries.
