“switch hook”的概念、定义、翻译、参考文献-科学参考

单词	switch hook
释义	switch hook [`swich ´hu̇k] ^ELECTRICITY A switch on a telephone set that operates when the receiver is placed on the hook or removed from it.
随便看	hard pad hard palate hardpan hard paste porcelain hard patch hard porcelain hard radiation hard return hard rime hard rock hard-rock driller hard-rock mine hard-rock miner hard-rock tunnel boring hard rot hard rubber hard-sectored disk hard silk hard site hard solder hard-solder hard-sphere collision theory hardstand hard superconductor hard-surface

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