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【单选题】
工程技术上的摩擦离合器是通过摩擦实现传动的装置，其结构如图所示。轴向作用力使A、B两个飞轮实现离合。当A轮与B轮接合并通过摩擦力矩带动B轮转动时，则此刚体系统在两轮接合前后( )。【图片】A.
角动量改变，动能亦改变
B.
角动量改变，动能不变
C.
角动量不变，动能改变
D.
角动量不变，动能亦不改变
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皮皮学刷刷变学霸
举一反三
【单选题】The price index in 2002 was 160, and in 2003 the price index was 1What was the inflation rate?______.
A.
68%
B.
8%
C.
0.05
D.
indeterminable without knowing the base year
【简答题】等级货物运价
【单选题】If the price of natural gas rises, when is the price elasticity of demand likely to be the highest?
A.
immediately after the price increase
B.
one month after the price increase
C.
three months after the price increase
D.
one year after the price increase
【简答题】The Hotels in Beihai Sun Hotel Rose Hotel Dates: Price ( a night ) Price (a night) 1 Oct.~21 Dec. ￥16...
【单选题】1) The price elasticity of demand measure
A.
the slope of a budget curve.
B.
how often the price of a good changes.
C.
the responsiveness of the quantity demanded to changes in price.
D.
how sensitive the quantity demanded is to changes in demand.
【单选题】What was the original price of an item if a discount of 20 percent reduced the price to $100?
A.
$80
B.
$120
C.
$125
D.
$150
E.
$250
【简答题】设变量已正确定义,选项( )与以下程序段不等价。 switch(choice){
case 1: price = 3.0;
case 2: price = 2.5;
default: price = 0.0;
}A. price = 0.0; B. switch(choice){ default: price = 0.0; case 2: price =...
【单选题】The word 'hampered' in Line 1 Para. 2 is closest in meaning to______.
A.
recognized
B.
determined
C.
solved
D.
hindered
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