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【单选题】
2004年美国圣路易斯大学研制了一种新型的乙醇电池,它用磺酸类质子溶剂,在200℃左右时供电,乙醇电池比甲醇电池效率高出32倍,且更安全。电池总反应为:C 2 H 5 OH+3O 2 = 2CO 2 +3H 2 O,电池示意如下图,下列说法不正确的是 [     ]
A.
a极为电池的负极
B.
电池工作时电流由b极沿导线经灯泡再到a极
C.
电池正极的电极反应为:4H + +O 2 +4e - =2H 2 O
D.
电池工作时,1 mol 乙醇被氧化时就有6 mol 电子转移
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【单选题】生产集中是指,生产资料、劳动力和商品的生产日益集中于少数大企业的过程,其结果是大企业所占的比重( )
A.
不断减少
B.
不断增加
C.
不变
D.
骤然下降
【判断题】作用于刚体上某一点的力,可移至刚体上任一点,而不改变对刚体的作用效应。
A.
正确
B.
错误
【单选题】What made Americans very proud in the past was ______.
A.
their strong economic and political power on world stage
B.
their capability on involving other people into their culture
C.
their great tolerance of the cultural features of immigrants
D.
their high fertility rate of native blacks and whites
【单选题】Americans are proud of their variety and individuality, yet they love and respect few things more than a uniform, whether it is the uniform. of an elevator operator or the uniform. of a five-star gene...
A.
still judge a man by his clothes
B.
hold the uniform. in such high regard
C.
enjoy having a professional identity
D.
will respect an elevator operator as much as a general in uniform
【判断题】沙坦类和普利类药物联合应用常用药高血压治疗。()
A.
正确
B.
错误
【简答题】简述生物利用度的定义和研究意义。
【单选题】What have Americans been proud of for a long time?
A.
Americans have been proud that their country is the richest one.
B.
Americans have been proud of belonging to the greatest power in the world.
C.
Americans have been proud of their improving quality of life.
D.
Americans have been proud that they have never lost hope for the future.
【判断题】生产集中是指生产资料、劳动力和商品的生产日益集中于国有大企业的过程,其结果是国家垄断资本主义的形成。
A.
正确
B.
错误
【多选题】生产集中是指生产资料、劳动力和商品的生产越来越被集中于少数大企业的过程,或者说少数大企业在整个社会生产中所占比重日益增大的过程。资本集中是指已经形成的各个资本的合并,它是通过大资本吞并小资本,或若干小资本联合成少数大资本而实现的个别资本迅速增大。关于生产集中与资本集中,下列说法正确的是
A.
它们是资本主义自由竞争的结果
B.
它们是剩余价值规律、竞争规律和资本积累规律作用的结果
C.
它们是生产社会化的重要表现
D.
它们是资本社会化的重要表现
【判断题】生产集中是指生产资料、劳动力和商品的生产日益集中于少数大企业的过程.
A.
正确
B.
错误
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