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【单选题】
下列多项式不能用公式法分解因式的是（ ）A.
-x 2 +a 2
B.
x 2 -2x+1
C.
x 2 +x+ 1 4
D.
a 2 +b 2
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举一反三
【单选题】The cost of fire insurance for a manufacturing plant is generally c onsidered to be a ( )
A.
product cost
B.
period cost
C.
variable cost
D.
all of these
【简答题】已知 t = linspace(0,20*pi, 501); plot3(t.*sin(t), t.*cos(t), t); 命令执行后绘制出上图, 如要绘制下图可以使用的命令是( )。A. plot3(t.*sin(t),t.*cos(t),t); hold on plot3(t.*sin(t), t.*cos(t), -t); B. plot3(t.*sin(t),t.*cos(t)...
【单选题】A manufacturing plant exhibits diseconomies of scale if long-run average cost (LRAC) is:
A.
decreasing as output increases, and the plant is at its minimum efficient scale if LRAC is at its lowest level.
B.
decreasing as output increases, and the plant is at its minimum efficient scale if LRAC is decreasing over the entire range of output.
C.
increasing as output increases, and the plant is at its minimum efficient scale if LRAC is at its lowest level.
【单选题】For a manufacturing company, identify the following as either product cost or period cost: Insurance on plant building
A.
product cost
B.
period cost
【单选题】For a manufacturing company, identify the following as either product cost or period cost: Utility expense for the manufacturing plant
A.
product cost
B.
period cost
【单选题】A cost-output relation for a specific plant and operating environment is the:
A.
short-run cost curve.
B.
long-run total cost curve.
C.
long-run marginal cost curve.
D.
long-run average cost curve.
【简答题】Hourly cost of ( )plant is generally less than ( ) plant.
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