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【单选题】
电气控制电路中有一种互锁电路,经常被应用;其主要作用是:A.
锁定开起动开关,以防被别人乱开机,防止产生安全事故
B.
用于关联两组电路,以便两组电路中的装置能协同地工作,保证两者速度一致
C.
用于锁定两组相反运动或相反作用的动作,每次主能让一组动作,另一组停止,防止造成故障或事故
D.
用于锁定两组电路,以便两组电路稳定地工作
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【简答题】Critical reading means reading with the goal of finding __________ of a material, whether its is fiction or nonfiction. When we read English newspapers, it is very important for us to judge whether th...
【多选题】About the usage of the second or third person, which of the following statements are TRUE?
A.
It means you will address the reader as “you.”
B.
In using the second or third person, the author is a detached narrator, a storyteller who is discussing the lives of others, but the author is not necessarily a character in this story.
C.
The third-person perspective has a similar effect of distancing the writer from the story, but it also removes the reader as a character.
D.
Using second and third person is a tool used more often in fiction than in creative nonfiction.
【多选题】下列对于果蝇唾腺染色体的描述哪些是正确的( )。
A.
唾液腺染色体形成时，染色体着丝粒和近着丝粒的异染色质区聚于一起形成染色中心。
B.
在显微镜下可观察到从染色中心伸出6条配对的染色体臂，5条为长臂，1条为短臂。
C.
果蝇消化道细胞发育到一定阶段便停止在分裂间期，但唾腺细胞中的染色体仍不断复制，形成约1000～4000拷贝的多线染色体。
D.
唾腺染色体染色后呈现深浅不同、疏密各异的横纹，这些横纹都具有种的特异性。
【单选题】Nonfiction means the following EXCEPT ______.
A.
real
B.
truthful
C.
imaginary
D.
factual.
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