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【单选题】
以下( )不属于系统维护的类型。A.
正确性维护
B.
适应性维护
C.
预测性维护
D.
完善性维护
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【单选题】听力原文： More than 50 percent of all homes in the U.S. have one thing in common people living in them keep one or two small animals as pets. In fact there are more pets in the U.S than children. Why? Res...
A.
That more work is necessary for those facts.
B.
That animals are helpless to healthy people.
C.
That animals can also become friends of humans.
D.
That they had a very successful discovery.
【简答题】In this section, you will hear a passage twice. You are required to choose one of the four choices marked A), B), C) and D) which stands for the exact word you have heard Researchers at the National [...
【简答题】Passage One At the base of a mountain in tanzania's Gregory Rift, Lake Natron burnsbright red, surrounded the remains of animals that were unfortunate enough tofall into the salty water. Bats, swallow...
【单选题】回答题 Fishing adds only about one percent to the global economy, but on a regional basis it can con-tribute extremely to human survival．Marine fisheries contribute more to the world&39; s supply of pro-...
A.
beef
B.
fish
C.
pork
D.
chicken
【单选题】In 1992, the bilateral agreement of the U.S. with the European Union regarding the subsidies for production of civil aircraft included that : a. direct government support for new airplane development ...
A.
B.
C.
D.
D
【简答题】(2019 原创 )China ’ s new-generation( 新一代 ) high-speed train, the Fuxing, is now one of the fastest trains in the world. It has changed the way we 1 . Now, there are thousands of high-speed trains runni...
【单选题】It can be inferred from Paragraph 2 that
A.
two percent of the families in the U.S. must pay estate tax.
B.
there is no need for one to pay asset tax if he owns more than $3.5 million in 2009.
C.
one has to pay asset tax no matter how much money he owns in 2010.
D.
one probably has to pay asset tax if he owns more than $ 1 million in 2011.
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