【简答题】Je ne trouve pas ma clé de voiture. Elle est .
【单选题】由简并半导体构成的pn结,其反向电流是由__________所构成
【单选题】妊娠母猪妊娠早期感染常发生流产, 妊娠后期, 母体内常发生死胎或木乃伊胎儿, 或产出弱胎、木乃伊胎儿、死胎等。新生仔猪和哺乳仔猪一旦发病, 病情严重, 损失很大, 几乎100%死亡。仔猪突然发病, 体温41°C以上, 精神沉郁, 运动失调, 震颤、痉挛、呕吐、腹泻, 或呈犬坐姿势、或侧卧作划水运动、或原地作转圈运动, 通常于38h 内死亡。这种病最可能是( )
【单选题】According to paragraph 3, what is unusual about the suns corona?
A.
It is the outmost layer of the sun's atmosphere and is correspondingly cooler.
B.
It is hotter than the photosphere despite being farther away from the core.
C.
It is 200 times as deep as the photosphere and is most visible to the naked eye.
D.
It is the layer of the sun's atmosphere where energy escapes as sunlight.
【单选题】What is the purpose of the network layer of the OSI seven layer model?
A.
It selects a route for the message, forming segments into packets and adding the header information.
B.
It encodes the packets into the medium that will carry them - such as an analog signal, if the message is going across a telephone line - and sends the packets along that medium.
C.
It translates the message into a language that the receiving computer can understand.
D.
it is the only part of the process a user sees.
【单选题】在导游服务过程中,我们面对客人有中国人也有外国人,有老人也有孩子,他们在旅游过程中,有各种各样的要求,甚至有个别客人素质非常低下,这些都要求我们导游要从容面对.合理处理,这体现了我们导游服务( )的特点。
【单选题】(单项选择题)在导游服务过程中,我们面对客人有中国人也有外国人,有老人也有孩子,他们在旅游过程中,有各种各样的要求,甚至有个别客人素质非常低下,这些都要求我们导游要从容面对、合理处理,这体现了我们导游服务()的特点。
【单选题】实际电源有内阻,可用有伴理想电源建立其电路模型,下述说法正确的是( )。
A.
有些只能等效为有伴电压源,有些只能等效为有伴电流源
C.
既可以等效为有伴电压源,也可以等效为有伴电流源