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【单选题】
两个螺母对顶拧紧,使螺栓在旋合受拉而螺母受压,构成螺纹连接副纵向压紧,从而起到防松作用的防松方法是A.
摩擦防松
B.
机械防松
C.
永久止动防松
D.
. 扣紧螺母防松
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反馈参考答案：
举一反三
【简答题】将工作表标题跨列合并后居中并适当调整其字体、加大字号,并改变字体颜色。适当加大数据表行高和列宽,设置对齐方式及销售额数据列的数值格式(保留2位小数),并为数据区域增加边框线。
【单选题】What was the thing that he was never able to remember?
A.
What happened immediately before or during the accident.
B.
What he had done for ten weeks after the accident.
C.
All of the previous years before the accident.
D.
His way round the village itself.
【单选题】设A是n阶方针,A经过若干次初等列变换变为B,则( )。
A.
B.
存在可逆矩阵P,使得PA=B
C.
存在可逆矩阵P,使得PB=A
D.
存在可逆矩阵P,使得BP=A
【简答题】影响硬化后水泥混凝土强度的主要因素有（）、（）、（）和（）等四大方面。
【单选题】_______ he did well, he was never top of his class.
A.
Although
B.
But
C.
Because
D.
Since
【简答题】The Internet is becoming more and more important in our life. How much do you know about it? What is the Internet? The Internet is a large, worldwide collection of computer networks. A network is a sm...
【简答题】While no one ever questioned his word, he was never a financial success .
【单选题】---Whose badminton racket is this? It looks nice. How much is it _______? ---Sorry, I don’t know.
A.
cost
B.
pay
C.
spend
D.
worth
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