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【简答题】
现有一S7-200系列PLC主机,其上标注有“AC/DC/RLY”字样,则表示此台PLC的供电电源为____电源,输入端采用____电源供电,输出端输出_____输出,既可外接_____负载,又可外接_____负载
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【简答题】We have received your letter of May 10th, (infrom) ______ us of the rise of the price.
【简答题】Cesar Pelli, one of the leading high-rise architects, calls our attention to the aspect that ______.
【单选题】下列对原核细胞mRNA的论述正确的是:
A.
多数为单顺反子mRNA
B.
为多顺反子mRNA,在转录后加工切割成单顺反子mRNA
C.
为多顺反子mRNA,翻译成一个大的蛋白质前体,经翻译后加工成若干个成熟的蛋白质
D.
为多顺反子mRNA,每个顺反子都有自己的起始和终止密码子,分别翻译成各自的产物
E.
为单顺反子mRNA,但由内含子和外显子相间排列
【简答题】根据《标准施工招标文件》中通用合同条款的规定，变更指示只能由（ ）发出。
【单选题】________ that saw the rise of quite a number of new writers.
A.
During the first half of the 18th century
B.
That it was in the first half of the 18th century
C.
It was in the first half of the 18th century
D.
It was the first half of the 18th century
【单选题】The rise of English novels was in the 18th century with______.
A.
Henry Fielding's Tom Jones
B.
Jonathan Swift's Gulliver's Travels
C.
Daniel Defoe's Robinson Crusoe
D.
Samuel Richardson's Pamela
【单选题】_____ the oil price is on the rise, lots of people go to work by BMW instead of driving cars.
A.
So that
B.
Even enough
C.
As if
D.
Now that
【单选题】Which of the following is the immediate cause for the rise of oil prices?
A.
A decline in the excess capacity of OPEC as a group.
B.
The failure to boost Iraq oil production quickly.
C.
United States foreign policy.
D.
The bombing of pipelines in Iraq.
【单选题】The dramatic rise in the number of homeless people in the 1980s cannot be attributed to the discharge of mentally ill persons from hospitals into 'community care. ' even though it is true that provisi...
A.
The policy of discharging mentally ill persons from hospitals was based on the supposition that their illnesses couldbe controlled by newly developed drugs.
B.
Without supervision in a hospital setting those people whose mental illness can be controlled by medication might not actually take prescribed medication.
C.
Some community-care programs for mentally ill persons did exist in the 1980' s, but those programs consisted primarily of outpatient clinics.
D.
The policy of discharging significant numbers of mentally ill persons from hospitals took effect in the 1960's.
E.
There have always been some people in large cities who have led a homeless existence.
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