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影响接触电阻的因素?
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【单选题】Naturalist: For decades we have known that the tuatara, a New Zealand reptile, have been approaching extinction on the South Island. But since South Island tuatara were thought to be of the same speci...
A.
In order to maximize the number of living things on Earth, steps should be taken to preserve all local populations of animals.
B.
When an animal is in danger of dying, there is an obligation to help save its life, if doing so would not interfere with the health or well-being of other animals or people.
C.
The threat of local extinction imposes no obligation to try to prevent that extinction, whereas the threat of global extinction does impose such an obligation.
D.
Human activities that either intentionally or unintentionally threaten the survival of an animal species ought to be curtailed.
E.
Species that are found in only one circumscribed geographical region ought to be given more care and attention than are other species because they are more vulnerable to extinction.
【单选题】As is well-known, the higher we go above the earth, the ______ air we have.
A.
rarer
B.
rare
C.
rarest
D.
more rare
【单选题】We have known each other _______.
A.
since we were young
B.
after we were young
C.
when we are young
【简答题】As is well-known, the higher we go above the earth, the ______ air we have. A) rarer B) rare C) rarest D) more rare
【判断题】导游人员要自觉地遵守国家的法律、法规,遵守旅游行业的规章,严格执行导游服务质量标准,严守国家的机密和商业秘密,维护国家和旅行社的利益,在接待外宾时做到 “内外一致原则” 。
A.
正确
B.
错误
【简答题】电路如图所示,反相输入端电压分别为1V、-2V、1.5V,试分别求出各电路输出电压u0的值。
【单选题】We have known each other .
A.
since we were young
B.
after we were young
C.
when we are young
D.
if we are young
【单选题】-Have all the students known that we will have an English exam this Saturday? -Yes. Every student about it. [ ]
A.
tells
B.
told
C.
was told
D.
has told
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