如图所示，在标明小圆圈处表示两杆或者杆和滑块可以相互自由转动，杆1和5相互垂直而且固定不动，两滑块可以沿穿过的杆滑动。杆2长√2，杆1长为1。当滑块在5上自由滑动时，杆2转过的最大角度为（）。<br/> <img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251126/23812406_0.png">

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It is on this ( ) that say that human civilization may have come from some plane

A premise B pretext C evidence D presentation

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He looks so depressed that he is not in the ( ) to go outing with us.

A emotion B feeling C mood D mind

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The homeless population in most of the country has been declining for years, tha

A insurance B profession C regulation D unemployment

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This kind woman, is our ( ) head teacher, now in a large family as a gold nanny

A some times B some time C sometime D sometimes

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While traveling in the frontier region, he ( ) many popular songs that are still

A designed B produced C composed D invented

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Lucy ( ) the teacher that she wrote the paper and did not plagiarize.

A reinforced B pledged C convinced D required

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After three hours, most of the toxins in his body had been ( ) and he was able t

A disposed B eliminated C abolished D canceled

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In our country, teachers generally require students to be quiet and ( ) in the c

A obedient B faithful C subsidiary D skeptical

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Because of illness, I ( ) going to the scene to watch that wonderful game.

A stopped B failed C missed D ceased

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It appears there's a ceasefire in the U.S. trade war with Europe. The two sides

A deficits B criteria C budgets D tariffs

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如图所示，在标明小圆圈处表示两杆或者杆和滑块可以相互自由转动，杆1和5相互垂直而且固定不动，两滑块可以沿穿过的杆滑动。杆2长√2，杆1长为1。当滑块在5上自由滑动时，杆2转过的最大角度为（）。