【单选题】【消耗次数：1】
若平面的一条斜线长为2，它在这个平面上的射影长为1，则这条斜线段与该平面所成的角是（ ）
①
30°
②
60°
③
120°
④
150°
参考答案：
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【单选题】
平面的正面投影积聚为一条直线并与OX轴平行，该平面是（ ）。
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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正平面
②
Normal
0
7.8 磅
0
2
false
false
false
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ZH-CN
X-NONE
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水平面
③
Normal
0
7.8 磅
0
2
false
false
false
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ZH-CN
X-NONE
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正垂面
④
Normal
0
7.8 磅
0
2
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铅垂面
【简答题】
用平面切割立体，平面与立体表面的交线称为，该平面为，由截交线围成的平面图形称为。[填空(1)]
【单选题】
一物块重P，放在粗糙的水平面上，其摩擦角max=20°，若力F作用于摩擦角之外，且已知力F=P，F与水平面的夹角为q=30°，则物体()。(注：物块不会翻倒)
①
能保持静
②
不能保持静止
③
处于临界状态
④
P与F的值较小时能保持静止，否则不能
【简答题】
平面体与平面体相交，其截断面为一平面。[填空(1)]
随机题目
【单选题】
At that time, the committee, so far as I know, _______ of three scientists, two professors, and four senior engineers.
①
composed
②
comprised
③
consisted
④
made up
【单选题】
-- How long ______ you ______ the library book?-- For three days.
①
have; borrowed
②
have; kept
③
borrow
④
were; kept
【单选题】
I ____ up early this morning, so I stayed in bed until 8 o’clock a.m. .
①
needn’t have got
②
didn’t need to get
③
shouldn’t have got
④
can’t have got
【单选题】
Only in this way ____ out of the plan.
①
you can talk him
②
him can you talk
③
him you can talk
④
can you talk him
【单选题】
People at the party worried about him, because no one was aware ______ he had gone.
①
of where
②
of the place where
③
where
④
the place
【单选题】
If you drink too much, your health will get even ____.
①
bad
②
poor
③
worse
④
not well
【单选题】
I haven’t seen her for years, but I could still ____ her voice on the phone.
①
recognize
②
realize
③
hear
④
know
【单选题】
As I knew him better, I discovered that my____ had been right.
①
enjoyment
②
improvement
③
impression
④
environment
【单选题】
His explanation is not at all clear. I find it ____.
①
essential
②
confusing
③
awful
④
puzzled