词汇	presumptive maintenance
释义	presumptive maintenance 预防性维护
随便看	principle of proportionalty principle of prosecution Principle of Protein Structure principle of provenance principle of proximate cause principle of proximity principle of prudence principle of publicity principle of public opening principle of public participant principle of public relations principle of public summons Principle of Pump Designing Principle of punishment principle of pupil rs receptivity principle of putting prevention compulsory principle of qualification principle of quantity principle of quantum electrodynamics principle of quantum mechanics principle of quasi continuity principle of radiometer principle of randomization principle of rationality principle of rationalization