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【单选题】
一台二冲程柴油机,经气阀定时测定发现,进气阀提前开启角相对活塞上止点提前一个β角,要把它恢复到正A.
应把凸轮（ ）。
B.
顺凸轮轴转动方向转动β角
C.
逆凸轮轴转动方向转动β/2角
D.
顺凸轮轴转动方向转动角β/2
E.
逆凸轮轴转动方向转动β角
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举一反三
【单选题】设随机变量 X 的方差为 2 ,则根据切比雪夫不等式有估计 P { | X - E ( X ) | 3 2} £ ( ).
A.
0.1
B.
0.2
C.
0.5
D.
0.9
【简答题】小题1:Louisa didn’t have a pencil，so I let her borrow (我的). 小题2:If everyone (遵守) the traffic rules, there will be fewer accidents. 小题3:I don’t know what her interests are, because we talk (主要地）about...
【简答题】We can make mistakes at any age．Some mistakes we make are about money．But most mistakes are about people．One might say, 'Did Jerry really care when I broke up with Helen?' 'When I got that great job, ...
【简答题】一个8K×8位的动态RAM芯片,其内部结构排列成256×256形式,读/写周期为0.1us,请问采用分散刷新方式的刷新间隔为( )us。(保留1位小数)
【单选题】Our talent show got _____ a great success _____ we became popular stars in our school.
A.
so, that
B.
such, that
C.
so, to
D.
such, to
【单选题】Rearrange the following parts of a response letter in a logical order. 1) You have found the right range hood manufacturer. As a leading enterprise in our industry, we constantly translate high-tech t...
A.
3)-1)-2)-4)-5)
B.
3)-1)-5)-2)-4)
C.
1)-5)-2)-4)-3)
D.
3)-2)-5)-1)-4)
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