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【单选题】
关于截交线说法错误的是:A.
截交线一定是一个封闭的平面图形
B.
平面与平面立体的截交线为封闭的平面多边形
C.
平面与曲面立体相交产生的截交线一定是封闭的平面曲线
D.
平面与球体的截交线一定是圆
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】---You are sweating. ______ I fetch you some water? ---It’s so kind of you.
A.
Can
B.
Must
C.
Shall
D.
Need
【单选题】—Can you fetch me some water? — _____________. [ ]
A.
It's a pleasure
B.
With pleasure
C.
My pleasure
D.
Don't say so
【简答题】there any water in the kettle? No, please fetch some.
【简答题】保护继电器按其组成元件分,有 、晶体管型和 等。
【单选题】To fetch water before breakfast seemed to be a rule ___________.
A.
to never break
B.
never to be broken
C.
never to have broken
D.
never to be breaking
【单选题】They found that the villagers fetch water from a dirty pond as there was no clean water available.
A.
wanted
B.
were able to
C.
were
D.
had to
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