【简答题】有3个阻值为6欧姆的电阻,若把它们串联,等效电阻是()欧姆,若把它们并联,等效电阻是()欧姆
【判断题】如果不能按时完成,也要告知调度 / 维修经理。
【单选题】下面双代号网络图中,工作 I 的工序关系不正确的( )
【单选题】下面的网络图中工作H的紧前工作是( )。
【单选题】2008年9月27日16时41分00秒,打开神舟七号载人飞船轨道舱舱门,首度实施空间出舱活动,第一次在茫茫太空留下中国人足迹的航天员是( )
【单选题】It can be inferred from Paragraph 2 that human society will become increasingly ______.
A.
worried about life on other planets.
B.
dependent on space tourism.
C.
accustomed to long-distance flights.
D.
associated with space exploration.
【单选题】下列A、B、C、D中有一处是错误的地方,请找出相应的错误字母代码。细胞减数分裂I中期,每条染色体含A2条染色单体,着丝点B分裂,染色体排在C赤道板两侧,此时染色体紧缩至D最短。
【单选题】In paragraph 2, why does the author mention that the period for different horseshoe crabs ranges from 22.2 to 25.5 hours?
A.
To illustrate that an animal's internal clock seldom has a 24-hour cycle
B.
To argue that different horseshoe crabs will shift from daytime to nighttime vision at different times
C.
To illustrate the approximate range of the circadian rhythm of all animals
D.
To support the idea that external cues are the only factors affecting an animal's periodic behavior