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【单选题】
表达某地两年几种疾病的患病率可用A.
直方图
B.
单式直条图
C.
复式直条图
D.
线图
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【简答题】In England nobody under eigh years old is allowed to drink in a bar. Mr Thompson often went to a bar near his house. But he never took his son, Tom, because he was too young. Then when I om had hi...
【单选题】一个带有气隙的铁芯线圈,接到电压一定的直流电源上,若气隙增大时,则线圈中的
A.
电流增大，磁通增大
B.
电流不变，磁通减小
C.
电流不变，磁通增大
D.
电流减小，磁通减小
【简答题】Tom is a young man. He has a very big dog and he has a very small car, too. He likes playing tennis, Today he plays tennis for two hours at the club and then he wants to go home by car. His dog comes ...
【单选题】一个带有气隙的铁芯线圈,接到电压一定的直流电源上,若气隙增大时,则线圈中的
A.
A电流增大，磁通增大
B.
B电流不变，磁通减小
C.
C电流不变，磁通增大
D.
D电流减小，磁通减小
【简答题】A、B、C为中学常见单质，其中一种为金属；通常情况下，A为固体，B为液体，C为气体．D、E、F、G、H、X、Y均为化合物，其中X是一种无氧强酸、E为黑色晶体，H在常温下为液体．它们之间的转化关系如图所示（其中某些反应条件和部分反应物已略去）． （1）反应①的基本反应类型是______． （2）E的俗称是______． （3）写出X的电子式______． （4）Y溶液显酸性，但一般不能用酸碱指示剂检...
【简答题】In England nobody under eigh years old is allowed to drink in a bar. Mr. Thompson often went to a bar near his house. But he never took his son, Tom, because he was too young. Then when Tom was on...
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