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【简答题】
计算三重积分 时，什么情况下采用“先重后单”的积分次序(即先计算一个二重积分，再计算一个定积分)较好？
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皮皮学刷刷变学霸
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【判断题】The irrigation tool of hudou is regarded as one of the earliest tools to put lever theory into practice.
A.
正确
B.
错误
【单选题】Which of the following sentences has the word “lever” with the same meaning and usage as that in “corruptly using the levers of government "?
A.
Pull the lever towards you to adjust the speed.
B.
The threat of sanctions is the most powerful lever for peace.
C.
I levered the lid off the pot with a knife.
D.
They managed to lever the door open.
【简答题】教师在做电子教案时,想粘贴从网上复制的文字,应使用_______快捷方式。
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