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【判断题】
切削用量三要素对切削力的影响程度是不同的,背吃刀量影响最大,进给量次之,切削速度影响最小。A.
正确
B.
错误
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【简答题】已知函数f（x）=ax-lnx， g(x)= lnx x ，它们的定义域都是（0，e]，其中e≈2.718，a∈R （ I）当a=1时，求函数f（x）的单调区间； （ II）当a=1时，对任意x 1 ，x 2 ∈（0，e]，求证： f( x 1 )＞g( x 2 )+ 17 27 （ III）令h（x）=f（x）-g（x）?x，问是否存在实数a使得h（x）的最小值是3，如果存在，求出a的值；如果不...
【简答题】The aggressive young man can go far in this firm.
【单选题】The following is an abstract, consisting of 5 sentences. Which element does Sentence ④describe?Abstract: ①Research on exposure to television and movie violence suggests that playing violent video game...
A.
the key results or findings
B.
background information
C.
the methods
D.
the main conclusion
【单选题】燃油泵进口的燃油漉网被污染，以下做法正确的是（）
A.
清洁燃油箱及燃油漉网，然后对燃油系统做进一步的检查
B.
把燃油泵进口处清洁干净，再装上燃油泵就可以继续使用
C.
更换油泵，旧滤网可以继续使用
D.
必须更换全新喷油器
【简答题】To produce the upheaval in the United States that changed and modernized higher education from the mid-1860s to the mid-1880s, several causes interacted. The emergence of a half-dozen leaders in educa...
【单选题】燃油泵进口处的燃油滤网被污染,以下做法正确的是( ) A. 清洁燃油箱及燃油滤网,然后对燃油系统做进一步检查B.把燃油泵进口处清理干净,再装上燃油泵就可以继续使用C.更换油泵,旧滤同可以继续使用D.必须更换全新噴油器
A.
1
B.
2
C.
3
D.
4
【简答题】已知f（x）=3 x ，f（a+2）=27，函数g（x）=λ?2 ax -4 x 的定义域为[0，2] （1）求a的值 （2）若函数g（x）的最大值是 1 3 ，求实数λ的值．
【单选题】The young adults who used to be aggressive but didn't watch much violent TV in childhood ______.
A.
turned out to be even more aggressive
B.
were less likely to get involved in crime
C.
showed a tendency to steal and fight aggressively
D.
became less aggressive than those watching violent TV shows in childhood
【简答题】Reading Comprehension Boys' schools are the perfect place to teach young men to express their emotions and are more likely to get involved in activities such as art, dance and music, according to rese...
【简答题】构成建筑的基本要素有哪些 ? 它们之间有什么关系 ?
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