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【单选题】
布尔表达式X=AB+CD表示 。A.
两个或运算再相与
B.
一个四输入与门
C.
两个与运算再相或
D.
一个异或门
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举一反三
【简答题】7-12 当温度为 时,可将气体分子视为刚性分子,求在此温度下:( 1 )氧分子的平均动能和平均转动动能;( 2 ) 氧气的内能;( 3 氦气的内能 .
【简答题】实地考察法包括（ ）、观察法和实验法A. 询问法
【简答题】Part B Describe the birth rate in the graph and the general trend after the founding of our country. And give the reasons. Write approximately 120 words.
【判断题】In the graph of the mortality rate over the last hundred years, the huge spike in 1918 indicates the number of people killed in World War I.
A.
正确
B.
错误
【单选题】Refer to Exhibit 3-1. In the graph of the circular flow model, area B represents
A.
product markets.
B.
firms.
C.
factor markets.
D.
households.
【单选题】Over several years, bacteria were isolated from members of a human population and tested for antibiotic resistance. The percent of bacterial isolates that were found to be antibiotic resistant is pres...
A.
The greatest increase in antibiotic resistance occurred from the first year to the third year of the study.
B.
Gene flow in the population occurred at the same rate for the entire duration of the eight-year study.
C.
Because evolution in bacterial populations occurs over millions of years, the results are due to random variation.
D.
Natural selection over multiple generations is favoring antibiotic resistance in the population of bacteria.
【判断题】Mesenteric lymph nodes arranged in the graph of bunch ofgrapes in the mesenteric root. ( )
A.
正确
B.
错误
【单选题】商务部认定第一批食品类老字号在全国范围内，分布数量排在前三维的区域是（ ）。
A.
北京、浙江、四川
B.
北京、上海、浙江
C.
四川、上海、山东
D.
北京、山西、广东话
【单选题】In the graph of the circular flow model below, area C represents
A.
product markets.
B.
firms.
C.
factor markets.
D.
households.
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