问题
选择题
下列物理量属于标量的是（ ）
A．速度
B．位移
C．功
D．电场强度
答案
位移、电场强度和速度都是即有大小又有方向，相加时遵循平行四边形定则的物理量，都是矢量，功是只有大小，没有方向的物理量，是标量，所以C是标量．
故选C．
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下列物理量属于标量的是（ ）
A．速度
B．位移
C．功
D．电场强度
位移、电场强度和速度都是即有大小又有方向，相加时遵循平行四边形定则的物理量，都是矢量，功是只有大小，没有方向的物理量，是标量，所以C是标量．
故选C．
In 2005, Carpet Company decides to change from the straight-line method of depreciation to the sum of the year’ s digits method. The following information is available :
| Pre-2005 | 2005 | |
| Straight Line Depreciation | $ 1600000 | $ 400000 |
| Sum of the Years Digits | $ 2300000 | $ 500000 |
A. $ 400000 depreciation expense in the 2005 income statement and $ 800000 separately as a change in accounting principle net of taxes.
B. $ 500000 depreciation expense in the 2005 income statement and $ 700000 separately as a change in accounting principle net of taxes.
C. $1200000 depreciation expense in the 2005 income statement and include a footnote of explanation including the tax effect.