皮皮学，免费搜题
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【判断题】
大肠杆菌的lac i基因与乳糖操纵子的作用是典型的负控阻遏系统，因为在这个系统中，i基因是调节基因，当它的产物——阻遏蛋白与操纵区结合时，RNA聚合酶便不能转录结构基因，即在环境中缺乏诱导物时，乳糖操纵子是受阻的。A.
正确
B.
错误
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举一反三
【单选题】Which of the followings are true about the terms of trade?
A.
also called exchang value
B.
the value is less than 100 when trade conditions better
C.
the value is greater than 100 when tade conditions better
D.
also called trade terms
【单选题】The commodity terms of trade measures
A.
The rate at which exports exchange for imports
B.
The influence trade has on productivity levels
C.
The effect on income of the trading nation
D.
The improvement in a nation's welfare
【单选题】The meaning of "terms of trade" is ( )
A.
the tariffs in place between two trading countries.
B.
the price of a country's exports divided by the price of its imports.
C.
the amount of exports sold by a country.
D.
the quantities of imports received in free trade.
【简答题】調査記事 練習二 二、2、
【单选题】The terms of trade is given by the prices:
A.
Paid for all goods imported by the home country
B.
Received for all goods exported by the home country
C.
Received for exports and paid for imports
D.
Of primary products as opposed to manufactured products
【单选题】The terms of trade is given by:
A.
(Price of exports/price of imports) − 100
B.
(Price of exports/price of imports) + 100
C.
(Price of exports/price of imports) ÷ 100
D.
(Price of exports/price of imports) × 100
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