判断题

确定摆放位置，主要从表面质量、零件强度、支撑材料、成型时间四个方面进行分析()

答案：正确

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In the following lists, choose the letter beside the sentence that does not develop the controlling idea which appears in the topic sentences.
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A． He knows all the details about all the manufacturers’ models.
B．He spends a lot of time each week making improvements on his old Ford
C．His parents allow him $5 50 a week for gas.
D．If there is a new-car exhibit in town, you will find him there.

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利用双原子势能模型解释热膨胀时，势能函数展开为泰勒级数后，忽略了（）以上的项。
A、x一次方
B、x二次方
C、x三次方
D、x四次方