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【多选题】
行车工况与废气的形成有密切关系，通常在（）会产生CO、HC。A.
暖机工况
B.
怠速运行工况
C.
中、低速均速行驶
D.
减速行驶
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举一反三
【单选题】A company with an operating income of $10,000 and a contribution margin ratio of 50% has a margin of safety of:
A.
$20,000
B.
$10,000
C.
$30,000
D.
It is not possible to determine the margin of safety from the information provided.
【单选题】A company with an operating income of $72,000 and a contribution margin ratio of 56% has a margin of safety of:
A.
$40,320.
B.
$128,571.
C.
$163,636.
D.
It is not possible to determine the margin of safety from the information provided.
【简答题】计算机病毒具有破坏性、隐蔽性、传染性、潜伏性和______等主要特点。
【简答题】计算机病毒具有破坏性、隐蔽性、潜伏性、激发性和（）等主要特点。
【简答题】计算机病毒具有破坏性、隐蔽性、（）、潜伏性和激发性等主要特点。
【单选题】The contribution margin is calculated as:
A.
Sales revenue minus cost of goods sold
B.
Sales revenue minus variable cost of goods sold
C.
Sales revenue minus total variable expenses
D.
Sales revenue minus total fixed expenses
【判断题】CM ratio, the contribution margin ratio is calculated by dividing the total contribution margin by total sales.
A.
正确
B.
错误
【单选题】电路如图所示,试判断电路中电流I1与I2 、I3、 I4
A.
I1=I2+I3+I4
B.
I2=I1+I3+I4
C.
I3=I1+I2+I4
D.
I4=I1+I2+I3
【单选题】As sales exceed the break‐even point, a high contribution‐margin percentage:
A.
a. increases profits faster than does a low contribution‑margin percentage
B.
b. increases profits at the same rate as a low contribution‑margin percentage
C.
c. decreases profits at the same rate as a low contribution‑margin percentage
D.
d. increases profits slower than does a low contribution‑margin percentage
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