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【单选题】
电缆敷设时应尽量避免穿越各种管道.铁路.公路.通信电缆.河流和渠道是为了()。A.
方便施工
B.
节约投资
C.
便于散热
D.
减少弯头
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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,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
C.
不能用硅胶做干燥剂
D.
排气温度调需采用水冷
【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】He saluted as they passed. He saluted ____.
A.
while they had passed
B.
while they were passing
C.
though they were passing
D.
because they had passed
【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.
不能用卤素捡漏灯
C.
不能用硅胶做干燥剂
D.
排气温度高需采用水冷
【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】• USD4500 Beijing, 10th March • I beg you to pay to Bank of China , Beijing
or order providing the goods they supply are complied with contract the sum of
Five Thousand United Sta...
【简答题】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, 1 he decided to beg something to eat. When a young woman opened the door...
【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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