2011年6月26日 · A simple vacuum tube, a triode, with its heated cathode. Source. As expected with an insulator, electrons cannot move in vacuum, there is no electric current, the impatient electrons must stay on their wire! However, in a vacuum tube there is a way to transfer more energy to the heated electrons packed on the cathode.

2012年7月1日 · A driving car makes a different sound than a car that is starting up. A driving car might purr if it's a good car, or hum or drone.

2013年12月8日 · Short Answer: Quietest sounds better to me, but both are grammatically correct. Long Answer: For comparatives and superlatives (-er and -est, respectively) forms of words, always use most for words with words for three or more syllables.

For this specific scenario, the usage of "opposite to" and "opposite" is indistinguishable in resulting meaning.

I have a story about the "on the bus". I read somewhere (or someone explained to me) that back in the day buses were open, so that one wasn't inside the bus per se, but rather on the top of the bus.

2011年12月13日 · Electrical isolation amounts to using an air gap (or vacuum) as an insulating (nonconducting) medium; like most electrical insulators, air has a breakdown voltage, typically about 1000V/mm, while the breakdown voltage in partial vacuum may be substantially less.

2010年9月18日 · I only relate my own experiences in the matter. Your observation that the objects a not necessarily unknown is valid, hence my frequent use of the weasel-word 'tends'. I agree with your observation about the vacuum cleaner, although I would tend to think in that case the use of "she" would tend to lean toward the pejorative. –

2011年3月20日 · In other words, don't talk about how the vacuum cleaner was made in Germany and incorporates the latest technology; tell the client he'll be able to vacuum the house in half the time and he'll never have to buy a replacement bag.

2014年8月13日 · There’s always spontaneous generation, which sounds a bit wacky until someone starts chatting you up about vacuum energy with particle pairs blinking into existence and quickly annihilating each other back into the nothingness whence they came. Ok fine, so it …

2012年1月17日 · Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.