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【简答题】
如果数字零输入的脉冲宽度小于PLC的循环周期,是否能保证PLC检测到该脉冲?为什么?
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举一反三
【单选题】In 1938 Pearl S. Buck became the first American woman ______ the Nobel Prize for Literature.
A.
receiving
B.
received
C.
who receives
D.
to receive
【单选题】According to the passage, Pearl Buck was an unusual figure in American literature in that she______.
A.
wrote extensively about a very different culture
B.
published half of her hooks abroad
C.
won more awards than any other woman of her time
D.
achieved her first success very late in life
【单选题】New technology links the world as never before. Our planet has shrunk. It's new a 'global village' where countries are only seconds away by fax or phone or satellite link. And, of course, our ability ...
A.
Critical.
B.
Prejudiced.
C.
Indifferent.
D.
Positive.
【单选题】According to the passage, Pearl Buck is known as a writer of all the following EXCEPT______.
A.
novels
B.
children's books
C.
poetry
D.
short stories
【单选题】阅读材料，回答题。 Extensive new studies suggest that the world has made extraordinary progress in reducing poverty in recent decades. The research suggests that the pace of economic progress has been rapid an...
A.
decreased
B.
climbed
C.
increased
D.
dropped into water
【单选题】The author's attitude toward Pearl Buck could best be described as______.
A.
indifferent
B.
admiring
C.
sympathetic
D.
tolerant
【简答题】高压试验变压器按照高压套管的数量，可将试验变压器分为（）、（）两类。
【简答题】什么是文献?文献的三要素有哪些?
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