皮皮学,免费搜题
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【简答题】
Airplanes are the preferred mode of transportation for mant people when taking a long trip. For others, cruise ships offer the best option. Yet, some travelers scorn(轻视) these modes of popular transportation. For them, the only way to truly experience a country is travelling overland by motorcycle, train or hitchhiking (免费搭乘顺路车). Kevin and Julia Sanders are two well-known overland travelers. In 35 days they rode by motorcycle from Alaska to the tip of South America, a journey of 20,000miles across 14 countries. The Sanders also traveled around the world by motorcycle in just over 19 days. Kevin believes that travelling by bike gives people more freedom because they never have to worry about bus or train schedules. Instead, you can organize your time the way you want. If you prefer to travel in a little more comfort, trains are another popular overland option. The train gives travelers the opportunity to interact with locals (本地人), and to go off the beaten track. Exploring Western Europe by train is a very popular adventure for college students as the train system is excellent, affordable and easy to navigate (导航). For the truly adventurous, hitchhiking can be an exciting way to see a country. Hitching can be quite dangerous and is not recommended in many countries, but when it is safe enough to do so, travelers love it. It is a guaranteed (保证的) way to meet people, and hitchhikers often learn things not found in travel guides.
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举一反三
【单选题】关于约束的说法正确的是( )。
A.
柔性约束,沿柔性轴线背离物体;
B.
光滑接触面,约束反力沿接触面公法线,指向物体;
C.
固定端支座,反力可以正交分解为两个方向假设;
D.
以上 AB 正确。
【单选题】关于约束的说法正确的是( )?
A.
柔体约束,沿柔体轴线背离物体。
B.
光滑接触面约束,约束反力沿接触面公法线,指向物体。
C.
固定端支座,反力可以正交分解为两个力方向假设。
D.
以上A B正确。
【简答题】CAD快捷命令:粘帖();栅格捕捉()。
【多选题】关于约束的说法正确的是( )。
A.
柔性约束,沿柔体轴线背离物体
B.
光滑接触面约束,约束反力沿接触面公法线,指向物体
C.
固定端支座,反力可以正交分解为两个力方向假设
D.
以上都不对
【单选题】关于约束的说法正确的是( )
A.
柔体约束,沿柔体轴线背离物体
B.
光滑接触面约束,约束反力沿接触面公法线,指向物体。
C.
固定铰链支座,反力可以正交分解为两个垂直方向的分力
D.
以上 ABC都正确
【单选题】关于约束的说法正确的是( )。
A.
柔性约束,沿柔体轴线背离物体。
B.
光滑接触面约束,约束反力沿接触面公法线,指向物体。
C.
固定端支座,反力可以正交分解为两个力方向假设。
D.
以上A、B正确。
【简答题】土中压缩变形主要是()的减小而产生的压缩变形。
【单选题】护理人员由于劳动强度过大,负荷过重,容易导致 ( )
A.
机械性损伤
B.
化学性损伤
C.
温度性损伤
D.
放射性损伤
E.
锐器伤
【单选题】关于约束的说法正确的是( )
A.
柔体约束,沿柔体中心线背离物体
B.
光滑接触面约束,约束反力沿接触面公法线,指向物体
C.
固定铰支座,约束反力可以 假设为一对 正交分力
D.
以上 A BC 正确
【单选题】属于静态干燥的是()
A.
烘箱干燥
B.
沸腾干燥
C.
喷雾干燥
D.
气流干燥
E.
上述都不是
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