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【单选题】
……………………… They are able to drive prices down by having a low advertised fare, and then making additional charges for “extras” such as booking a seat or checking in luggage carried in the aircraft’s hold, things that were normally included in the fares of the legacy carriers, the airlines with a long established reputation. There are other efficiencies, such as the use of smaller less expensive airports, that can also keep costs down.A.
One reason for this growth is that travellers are able to find low-cost deals more easily using the internet.
B.
One reason for this growth is that low-cost carriers (LCCs) have gained a larger share of the market.
C.
One reason for this growth is that many more airlines have entered the market, providing a greater range of choices for travellers.
D.
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【单选题】下面对《登幽州台歌》理解 正确 的一项是( )
A.
俯仰天地,天高地远,寰宇苍茫,诗人陈子昂内心澎湃,感到奋进激昂,梦想在广阔的天地间一展风采。
B.
这首诗通过描写登楼远眺,凭今吊古所引起的无限感慨,抒发了诗人抑郁已久的悲愤之情。
C.
《登幽州台歌》全诗笔法细腻,结构完整,情景交融,韵味悠长。
D.
《登幽州台歌》从时间和空间两个角度来表达诗人内心对未来的无限畅想,渴望建功立业的美好愿望。
【简答题】555定时器可以构成施密特触发器,施密特触发器具有滞后电压传输特性,此特性又称为_____特性,主要用于波形的_____、_____和_____;555定时器还可以用作多谐振荡器和_____稳态触发器。_____稳态触发器只有一个_____态、一个_____态,当外加触发信号作用时,_____态触发器能够从_____态翻转到_____态,经过一段时间又能自动返回到_____态,主要用于_____、...
【简答题】555定时器可以构成施密特触发器,施密特触发器具有滞后电压传输特性,此特性又称为_____特性,主要用于波形的_____、_____和_____;555定时器还可以用作多谐振荡器和_____稳态触发器。_____稳态触发器只有一个_____态、一个_____态,当外加触发信号作用时,_____态触发器能够从_____态翻转到_____态,经过一段时间又能自动返回到_____态,主要用于_____、...
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