题目内容：
当x→0时，3x-l是x的（ ）。
A．高阶无穷小 B．低阶无穷小
C．等价无穷小
D．同阶但非等价无穷小
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答案解析：
单选题：当x→0时，3x-l是x的（ ）。
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- 题目类型：单选题
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B．低阶无穷小
C．等价无穷小
D．同阶但非等价无穷小
B．低阶无穷小
C．等价无穷小
D．同阶但非等价无穷小
在三维空间中方程y2-z2=1所代表的图形是（ ）。
在三维空间中方程y2-z2=1所代表的图形是（ ）。 A．母线平行x轴的双曲柱面 B．母线平行y轴的双曲柱面 C．母线平行z轴的双曲柱面 D．双曲线
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Exercise helps you________．A．save calories and gain weight B．save calories bu
Jack asked Tom to return the storybook next Monday．Tomto re
Jack asked Tom to return the storybook next Monday．Tomto return the storybook
—Can you come on Monday or Tuesday?—I'm afraid________ day
—Can you come on Monday or Tuesday?—I'm afraid________ day is possible．A．eith
We＿＿a lot from the farmers when we stayed with them．
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