皮皮学，免费搜题
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【单选题】
以下认证 最为安全的是( )A.
用户名 + 密码
B.
卡 + 密钥
C.
用户名 + 密码 + 验证码
D.
卡 + 指纹
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】何一种机器的更新换代都存在哪三个途径?
【简答题】Which of the following require firms to pay to pollute?(i) corrective taxes(ii) tradable pollution permits(iii) pollution regulationsA. (i) only B. both (i) and (ii) C. (iii) only D. both (ii) and ...
【简答题】任何一种机器的更新换代都存在哪三个途径？
【判断题】Although regulation and corrective taxes are both capable of reducing pollution, regulation accomplishes this goal more efficiently.
A.
正确
B.
错误
【单选题】Some psychologists argue that the traditional idea 'spare the rod and spoil the child' is not rational.
A.
helpful
B.
kind
C.
sensible
D.
effective
【单选题】Most economists prefer corrective taxes to regulation tocorrect the pollution problem because:
A.
the market-based solution is less costly to society.
B.
the market-based solution can result in a greater reduction in pollution.
C.
the market-based solution raises revenue for the government.
D.
all of the above.
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