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【单选题】
某商品的供给曲线是一条通过原点的直线,则该供给曲线的供给弹性是( )A.
随价格的变化而变化
B.
恒为1
C.
不可固定
D.
等于曲线得斜率
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举一反三
【单选题】以R134a代替过去常用的氟利昂作制冷剂,以下说法不对的是_____。
A.
不能用硅胶做干燥剂
B.
必须改用适于它的脂类润滑油
C.
排气温度高需采用水冷
D.
不能用卤素检漏灯
【单选题】以R134a代替过去常用的氟利昂作制冷剂，下列说法不对的是（）。
A.
必须改用适于它的脂类润滑油
B.
不能用卤素检漏灯
C.
不能用硅胶做干燥剂
D.
排气温度高需要采用水冷
【单选题】以R134a代替过去常用的氟利昂作制冷剂，以下说法不对的是_______。
A.
不能用硅胶做干燥剂
B.
必须改用适于它的脂类润滑油
C.
排气温度高需采用水冷
D.
不能用卤素检漏灯
【单选题】以R134a代替过去常用的氟利昂作制冷剂,下列说法不正确的是 。
A.
必须改用适于它的脂类润滑油
B.
不能用卤素检漏灯
C.
不能用硅胶作干燥剂
D.
排气温度高'需采用水冷
【简答题】One day, a poor boy who was trying to pay his way through school by sending newspapers door to door, was so hungry that he decided to beg for a meal at the next house. However, he lost his nerve when ...
【简答题】One day, a poor boy who was trying to pay his way through school by selling goods door to door found that he had ten cents left. He was hungry so he decided to beg* for a meal at the next house. Howev...
【简答题】A poor boy , named Howard Kelly , was trying to pay his way through school by selling goods door to door . He was hungry , 36 he decided to beg something to eat . When a young woman opened the door , ...
【简答题】One day, a poor boy who was trying to pay his way through school by selling goods door to door found that he only had one dime (一角硬币) left. He was hungry so he decided to beg for a meal at the next ho...
【单选题】75以R134a代替过去常用的氟利昂作制冷剂,下列说法不正确的是 。
A.
必须改用适于它的脂类润滑油
B.
不能用卤素检漏灯
C.
不能用硅胶作干燥剂
D.
排气温度高'需采用水冷
【简答题】III . 完形填空。 阅读下面短文,从短文后各题所给的 A 、 B 、 C 、和 D 四个选项中 , 选出可以填入空白处的最佳选项。 One day, a poor boy, named Howard Kelly, was trying to pay his way through school by selling goods door to door. He was hungry, 61 _...
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