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【单选题】
Chuck spends all his income on two goods: tacos and milkshakes. His income is $100, the price of tacos is $10, and the price of milkshakes is $2. Put tacos on the horizontal axis and milkshakes on the vertical axis. The slope of Chuck's budget line is equal to
A.
–1/5.
B.
–5.
C.
1/5.
D.
5.
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【简答题】材料:低碳经济是指以低能耗、低污染、低排放为基础的经济模式,是人类社会继农业文明、工业文明之后的又一次重大进步。随着联合国气候大会召开,“低碳经济”开始成为热门话题。在“十一五”规划纲要中提出,到2010年,中国单位GDP能耗要比2005年降低20%,主要污染物排放总量减少10%。为此,国家将通过制定和完善鼓励节能减排的税收政策,适时出台燃油税,研究开征环境税等一系列措施,淘汰一批炼铁、炼...
【单选题】I felt very sorry that I was not ____________ to help you.
A.
organize
B.
in a position
【单选题】— Why is your bedroom so dirty? — Sorry, Mum. It ___________. I felt very tired after playing soccer.
A.
isn’t cleaned
B.
didn’t clean
C.
doesn’t clean
D.
wasn’t cleaned
【简答题】物理天衡时,用了50克砝码一个,20克砝码一个,游码如图示,总质量为( )克
【单选题】— I'm sorry; I shouldn't have been so rude to you. — You _____ something not very nice to me, but that's OK. [     ]
A.
have said
B.
had said
C.
were saying
D.
did say
【单选题】______I heard the sad news, I felt sorry.
A.
The moment as
B.
The moment
C.
At the moment
D.
In the moment when
【简答题】清洁的能源是指哪些?
【单选题】I felt very sorry that I was not ____________ to help you.
A.
organize
B.
. ability
C.
in a position
【多选题】安检设备日常维护保养应注意检查下述哪些内容()
A.
显示器、键盘及光障的清洁。
B.
操作键盘上所有按键功能是否正常
C.
设备电动滚筒是否漏油,传送带是否损伤或跑偏
D.
设备入口端及出口端的电源指示灯、X射线指示灯是否损坏
E.
检查通道出入口的铅门帘
【简答题】材料:低碳经济是指以低能耗、低污染、低排放为基础的经济模式,是人类社会继农业文明、工业文明之后的又一次重大进步。随着联合国气候大会召开,“低碳经济”开始成为热门话题。在“十一五”规划纲要中提出,到2010年,中国单位GDP能耗要比2005年降低20%,主要污染物排放总量减少10%。为此,国家将通过制定和完善鼓励节能减排的税收政策,适时出台燃油税,研究开征环境税等一系列措施,淘汰一批炼铁、炼...
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