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【多选题】
Heavy smokers and drinkers run a fifteen-times greater risk of developing cancer of the mouth and throat than nonsmokers and nondrinkers.A.
Cancer of the mouth and throat is more likely to occur in heavy smokers and drinkers than in nonsmokers and nondrinkers.
B.
People who never drink and smoke will not get mouth or throat cancer.
C.
Heavy drinkers who run have a greater risk of developing cancer than nondrinkers.
D.
People who don't smoke and drink have less chance of getting cancer of the mouth and throat than those who smoke and drink heavily.
E.
People would probably be healthier if they did not drink and smoke too much.
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【简答题】在串联电路中,总电压被分配到各个电阻上,阻值大的电阻分得的电压 ;阻值小的电阻分得的电压 。串联电路的这种作用叫做 作用。
【单选题】假设一个元组在子查询1中出现m次,在子查询2中出现n次,其中m>0,n>0,则下列说法正确的是_________。
A.
该元组在“子查询1 Except 子查询2”中出现0次;
B.
该元组在“子查询1 Union 子查询2”中出现m + n次;
C.
该元组在 “子查询1 Except All 子查询2”中出现m – n次;
D.
该元组在“子查询1 Union All 子查询2”中出现max(m,n)次;
【简答题】Questions 25 to 27 are based on thefollowing news.At the end of the news item,you will be given 15 seconds to answer the questions. Now, listen to the news. Who will be expulsed? [A] An Israeli diplom...
【简答题】在串联电路中,总电压被分配到各个电阻上。阻值大的电阻分得的电压(__),阻值小的电阻分得的电压(__)。串联电路的这种作用叫作(__)作用。
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