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位错，层错等缺陷越多，半导体的少子寿命越短
A、正确
B、错误

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单项选择题
When did you last see a polar bear? On a trip to a zoo, perhaps? If you had attended a winter activity in New York a few years ago, you would have seen a whole polar bear club. These " Polar Bears" are people who meet frequently in winter to swim in freezing cold water. That day, the air temperature was 3℃, and the water temperature was a bit higher. The members of the Polar Bear Club at Coney Island, New York are usually about the age of 60. Members must satisfy two require-ments. First, they must get along well with everyone else in the group. This is very important because there are so many different kinds of people in the club. Polar Bears must also agree to swim outdoors at least twice a month from November through February.
Doctors do not agree about the medical effects of cold-water swimming. Some are worried about the dangers of a condition in which the body′ s temperature drops so low that finally the heart stops.
Other doctors, however, point out that there is more danger of a heart attack during summer swimming because the difference between the air temperature and water temperature is much greater in summer than in winter.
The Polar Bears themselves are satisfied with the benefits (or advantages)of cold-water swim-ming. They say that their favorite form of exercise is very good for the circulatory system(循环系统)because it forces the blood to move fast to keep the body warm. Cold-water swimmers usually turn bright red after a few minutes in the water. A person who turns blue probably has a very poor circula-tory system and should not try cold-water swimming.
The main benefits ( or advantages) of cold-water swimming are probably mental. The Polar Bears love to swim year-round; they find it fun and relaxing. As one 70-year-old woman says, "When I go into the water, I pour my troubles into the ocean and let them float away. "
The Polar Bears like to swim all the year round, for .
A.theycanremainyoung
B.itisaneasywaytokeepthebodywarminwinter
C.theyfinditenjoyableandinteresting
D.theymightmeetfewertroublesinlife
单项选择题
在实施物流与商流分离策略时，分工协作的基本准则是(    )。
    
A 商流必须服从物流 

B 商流和物流要合理配置

C 有利于实现物流功能
D 物流必须服从商流
单项选择题
在投资方案财务评价中，获利能力较差的方案是（　　）。
A.内部收益率小于基准收益率，净现值小于零
B.内部收益率小于基准收益率，净现值大于零
C.内部收益率大于基准收益率，净现值小于零
D.内部收益率大于基准收益率，净现值大于零
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