对于由四舍五入得到的近似数2.8和2.80，下列说法正确的是[ ]

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问题选择题

A．有效数字和精确度都相同

B．有效数字相同，精确度不同

C．有效数字不同，精确度相同

D．有效数字和精确度都不同

答案

答案：D

填空题

研究金属块与水平桌面间的动摩擦因数，可按以下方法进行：先用弹簧秤称量出金属块的重力为G，再用弹簧秤水平的拉着金属块在桌面上做匀速直线运动，读出此时弹簧称的示数为F：则由此即可确定出金属块与桌面间的动摩擦因数μ=______．

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单项选择题

A company purchased a new pizza oven directly from Italy for $ 12675. It will work for 5 years and has no salvage value. The tax rate is 41 percent, and annual revenues are constant at $ 7192. For financial reporting, the straight-line depreciation method is used, but for tax purposes depreciation is accelerated to 35 percent in years 1 and 2, and 30 percent in year 3. For purposes of this exercise ignore all expenses other than depreciation. Assume the tax rate for years 4 and 5 changed from 41 percent to 31 percent. What will be the deferred tax liability as of the end of year 3 and the resulting adjustment to net income in year 3 for financial reporting purposes due to the change in the tax rateDeferred Tax Liability Net Income ①A. $1572 $ 507 ②B. $1572$ 747 ③C. $1039$ 5O7

A．

A. ①

B．

B. ②

C．

C. ③

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