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【单选题】
我们的生活离不开水．下列有的认识中错误的是（ ）A.
可用肥皂水来区分硬水和软水
B.
使用无磷洗衣粉有利于保护水资源
C.
自然界的不是纯净的水
D.
地球上水资源丰富，淡水取之不尽，用之不竭
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反馈参考答案：
举一反三
【单选题】To Dad's suggestion concerning how many lessons she was to take per week, Susie ______.
A.
was pleased and did not argue
B.
was dissatisfied and argued for more lessons
C.
agreed in front of Dad but was thinking of taking more lessons without telling Dad
D.
cried and went to mother for help
【简答题】梁的正应力计算公式为： ≤f，式中：γ x 是______，W nx 是______。
【简答题】如图所示，设材料拉伸的应力一应变关系为σ=Cε n ，式中C及n皆为常量，且0≤n≤1。压缩的应力一应变关系与拉伸的相同。梁截面是高为h宽为b的矩形。试导出纯弯曲时弯曲正应力的计算公式。
【简答题】表面粗糙度是指( )所具有的( )和( )不平度。
【简答题】梁的正应力计算公式为: ≤ ,式中: 是 , 是 对 。
【简答题】表面粗糙度是指______所具有的______和______。
【简答题】已知某图采取如图所示的邻接矩阵表示法,请回答下列问题: (1)请画出该图。 (2)对其从顶点A开始进行深度优先遍历,写出遍历序列。
【简答题】A．Five lessons. B．Three lessons. C．Twelve lessons. D．Fif lessons.
【单选题】What kind of lessons will the students have?
A.
The same lessons.
B.
Individual lessons according to their ability levels.
C.
Individual lessons according to the teacher's instruction.
D.
Individual lessons according to their parents' instruction.
【简答题】Now, there is a new-type school in New York, which has no everyday lessons, no class teachers and even no school buildings. It is called “City-as-School”. The name just means the city itself is the pl...
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