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【单选题】
梁平面弯曲时,横截面上各点正应力的大小与该点到_______的距离成正比。A.
截面形心
B.
纵向轴线
C.
中性轴
D.
横向轴线
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反馈参考答案：
举一反三
【单选题】On Buy Nothing Day, people are encouraged ________anything.
A.
not to buy
B.
to buy
C.
not buy
D.
buy
【单选题】The best title for the passage might be ______.
A.
Buy Nothing Day in the U.S.
B.
The Future of Buy Nothing Day
C.
Free Dinners on Buy Nothing Day
D.
Students'Activities on Buy Nothing Day
【单选题】常用的通量测定方法中，（）强调根据乱流扩散理论，通过单位面积的任意动量或标量的通量密度是其浓度梯度与扩散系数的函数。
A.
波文比-能量平衡法
B.
空气动力学法
C.
涡度相关法
D.
感热密度分析法
【单选题】According to the passage, which of the following statements is TRUE?
A.
Buy Nothing Day has become popular in the United States.
B.
Restaurants have a tradition of donating food on holidays.
C.
Girl shops are expected to be closed on Buy Nothing Day.
D.
Children like the idea of Buy Nothing Day best.
【单选题】Ad valorem tariffs are collected as
A.
fixed amounts of money per unit traded.
B.
a percentage of the price of the product.
C.
a percentage of the quantity of imports.
D.
All of the above.
【单选题】在教学过程中，教师为了让学生掌握知识的本质意义，需要变换知识的呈现方式，其中本质属性保持恒在，而非本质属性可有可无，这在心理学中称为（ ）。
A.
变式
B.
比较
C.
概括
D.
抽象
【简答题】写出下列物理量的单位(无单位的必须写“无”) : 热导率 热扩散系数
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