【单选题】【消耗次数：1】
The companies are working together to create [] they hope will be the best means of transport in the 21st century.
①
which
②
that
③
what
④
who
参考答案：
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相关题目
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By the middle of the 21st century, the vast majority of the world’s population ____ in cities rather than in the country.
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are living
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will be living
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have lived
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will have lived
【单选题】
She prefers_______ together to working all by herself.
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working
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to work
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to working
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Who exerts the single most important influence on literary naturalism, of which Theodore Dreiser and Jack London are among the best representative writers?
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Freud
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Darwin
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W. D. Howells
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Emerson
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Some companies have introduced flexible working time with less emphasis on pressure ____.
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than more on efficiency
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than efficiency
【单选题】
They are working hard to____ what they have lost.
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make out for
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keep up with
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【判断题】
It is often the case___as ___anything is possible for those who hang on to hope.
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Not until the early years of the 19th century ____ what heat is.
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随机题目
【单选题】
材料不同的两物块A和B叠放在水平面上，已知物块A重0.5kN，物块B重0.2kN，物块A、B间的摩擦系数f1=0.25，物块B与地面间的摩擦系数f2=0.2，拉动B物块所需要的最小力为( )。<img src="20190823/1566524729862419.jpg" title="1566524729862419.jpg" alt="建筑力学图片1.jpg"/>
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【单选题】
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力可以平移到刚体内的任意一点。
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力偶在任何坐标轴上的投形恒为零。
③
力系的合力在某一轴上的投形等于各分力在同一轴上投形的代数和。
④
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【单选题】
下列说法正确的是（）。
①
在工程力学中我们把所有的物体都抽象化为刚体。
②
工程力学中我们把所有的物体都抽象化为变形体。
③
稳定性是指结构或构件保持原有平衡状态。
④
工程力学是在塑性范围内，大变形情况下研究其承截能力。
【单选题】
平面一般力系的二力矩式平衡方程的附加使用条件是( )。
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二个矩心连线与投影轴无关
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投影轴通边一个矩心
③
二个矩心连线与投影轴垂直
④
二个矩心连线与投影轴不垂直