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【简答题】
从保证制动时方向稳定性出发,对制动系的要求是什么?
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【简答题】弯曲液面内外附加压强△ P= 。肥皂泡内外的压强差△ P'= 。
【单选题】弯曲液面的附加压强方向为
A.
指向液体内部
B.
指向液体外部
C.
沿液体表面方向
D.
指向弯曲液面的曲率中心
【简答题】Look,read and choose. (看图选择相应的单词) (     )(1)I'm a (     )(2)I'm a (     )(3)I'm from (     )(4)Good
【单选题】. . — You look troubled. — The director asked me to finish this task by Sunday. How can I ________ to?
A.
attempt
B.
manage
C.
decide
D.
happen
【单选题】弯曲液面内外附加压强为
A.
4a/R
B.
2a/R
C.
a/4R
D.
a/2R
【单选题】Task 2 Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45. Ask three people to look out the same window at a busy street comer and tell yo...
A.
they will give three different answers
B.
they will see three different scenes
C.
they cannot see clearly
D.
they can only see the busy traffic
【判断题】弯曲液面的附加压强定义是液内压强减去液外压强,其中凸液面附加压强为正,凹液面附加压强为负。
A.
正确
B.
错误
【单选题】弯曲液面的附加压强方向
A.
指向弯曲液面的曲率中心
B.
指向液面外侧
C.
指向液面内侧
D.
无法确定方向
【单选题】弯曲液面的附加压强方向是
A.
一定指向液体内部;
B.
一定指向液体外部;
C.
一定沿液体的表面;
D.
一定指向曲率中心
【简答题】Task 1 Look at the movie poster and guess its movie type.
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