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某工程有4个不同的土方施工项目，要分派4台推土机去完成，每台承担各项任务的台班产值见表4-1所示。请回答以下相关问题，以求出台班总产值最高的机械分派方案。

表4-1中，（）任务产值最大。

A.A3推土机对应的B1

B.A3推土机对应的B4

C.A2推土机对应的B2

D.A1推土机对应的B3

答案

参考答案：A

单项选择题

Fares on the city-run public buses in Greenville are subsidized by city tax revenues, but among the beneficiaries of the low fares are many people who commute from outside the city to jobs in Greenville. Some city councilors argue that city taxes should be used primarily to benefit the people who pay them, and therefore that bus fares should be raised enough to cover the cost of the service.
Each of the following, if true, would weaken the argument advanced by the city councillors EXCEPT:

A．Many businesses whose presence in the city is beneficial to the city’s taxpayers would relocate outside the city if public-transit fares were more expensive.

B．By providing commuters with economic incentives to drive to work, higher transit fares would worsen air pollution in Greenville and increase the cost of maintaining the city’s streets.

C．Increasing transit fares would disadvantage those residents of the city whose low incomes make them exempt from city taxes, and all city councillors agree that these residents should be able to take advantage of city-run services.

D．Voters in the city, many of whom benefit from the low transit fares, are ply opposed to increasing local taxes.

E．(E) People who work in Greenville and earn wages above the nationally mandated minimum all pay the city wage tax of 5 percent.
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多项选择题

哪项心律失常可发生于正常健康人？（）

A.室性心动过速

B.三度房室传导阻滞

C.房性早搏

D.室性早搏

E.阵发性室上性心动过速
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