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【简答题】
Finding a good work-at-home job is not easy. Although you see all the online advertising, there aren’t that many of them. Those that are available may require that you live in a certain area or spend at least some time in the office. Others may be only part-time jobs. Keep in mind that the skills needed for home employment are similar to those needed for working in an office. You’ll also need a home office with a high speed internet connection, phone, fax, computer, printer, and other basic office equipment. To get started, consider your job search as your job. Spend as many hours per week on your job search as you would spend working. If you’re looking for full-time work, you should be spending full-time hours seeking a job. Networking (人际关系) remains the top way to find a job and it does work. Develop contacts—friends, family, even the other job seeker—anyone who might have the information you need. You can take a direct approach and ask for job information or try a less formal approach and ask for information and advice. Contact everyone you know and tell them you want to work from home. You may be surprised by the people they know and the job information they can provide.
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【单选题】W18Cr4V属于高速钢的一种,我们一般称为( )
A.
T1
B.
M2
C.
T10
D.
M42
【单选题】加工一般金属用的高速钢,常用牌号有W18Cr4V和( )两种。
A.
CrWMn
B.
9SiCr
C.
1Cr18Ni9
D.
W6Mo5Cr4V2
【单选题】下列有关孟德尔遗传定律的说法,错误的是 ( )
A.
叶绿体基因控制的性状遗传不遵循孟德尔遗传定律
B.
受精时,雌雄配子的结合是随机的,这是得出 孟德尔遗传定律 的条件之一
C.
孟德尔发现分离定律和自由组合定律的过程运用 了假说 - 演绎法
D.
基因型为 AaBb 的个体自交,其后代一定有 4 种 表现型和 9 种基因型
【简答题】W18Cr4V钢的A c1 约为820℃,若以一般工具钢A c1 +30-50℃常规方法来确定淬火加热温度,在最终热处理后能否达到高速切削刃具所要求的性能?为什么?W18Cr4V钢刀具在正常淬火后都要进行560℃三次回火,又是为什么?
【简答题】W18Cr4V钢的A C1 约为820℃,若以一般工具钢A C1 +30~50℃的常规方法来确定其淬火加热温度,最终热处理后能否达到高速切削刀具所要求的性能?为什么?其实际淬火温度是多少?W18Cr4V钢刀具在正常淬火后都要进行560℃三次回火,这又是为什么?
【单选题】下列有关孟德尔遗传规律的说法错误的是 [     ]
A.
叶绿体基因控制的性状遗传不遵循孟德尔遗传规律
B.
受精时,雌雄配子的结合是随机的,这是得出孟德尔遗传规律的条件之一
C.
孟德尔发现分离定律与自由组合定律的过程运用了假说—演绎法
D.
基因型为AaBb的个体自交,其后代一定有4种表现型和9种基因型
【简答题】W18Cr4V钢的A c1 约为820℃,若以一般工具钢A c1 +(30~50)℃的常规方法来确定其淬火加热温度,最终热处理后能否达到高速切削刀具所要求的性能?为什么?其实际淬火温度是多少?W18Cr4V钢刀具在正常淬火后都要进行560℃三次回火,这又是为什么?
【简答题】W18Cr4V钢的淬火加热温度高达1280℃左右,若以一般工具钢Ac1+(30~50℃)的方法来确定其淬火加热温度,淬火后W18Cr4V制造的刃具能否达到要求的性能?为什么?
【简答题】w18Cr4V钢的A c1 约为820℃,若以一般工具钢A c1 以上30~50℃常规方法来确定其淬火加热温度,在最终热处理后能否达到高速钢切削刃具所要求的性能?为什什么?
【判断题】左氧氟沙星制剂少,临床常用于敏感菌感染的治疗。
A.
正确
B.
错误
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