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【多选题】
在数控机床上加工零件,由于工序集中,往往是在一次装卡中完成全部工序,因此,对零件的定位、夹紧方式要充分注意下面的问题A.
应减少进退刀时间和其它辅助时间
B.
零件定位、夹紧的部位应考虑到不妨碍各部位的加工、更换刀具以及重要部位的测量
C.
尽量采用组合夹具
D.
夹紧力求通过（或靠近）主要支撑点或在支撑点所组成的三角内
E.
零件的装卡、定位要考虑到重要安装的一致性
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【单选题】We visited the museum, _____ was set up in memory of those killed in the 2008 Wenchuan Earthquake.
A.
which
B.
that
C.
where
D.
when
【单选题】海洋石油开发对海洋造成污染主要表现在：生活、生产以及自然过程中产生的废弃物、含油污水排人海洋；发生意外漏油、溢油、井喷等事故。其最大危害是对海洋生物产生的影响。油膜和油块能粘住大量鱼卵和幼鱼，使鱼卵死亡、幼鱼畸形，还会使鱼虾类产生石油臭味，而成年鱼类、贝类长期生活在被污染的海水中，其体内蓄积了某些有害物质，当进入市场被人食用后则危害人类健康。防止海洋石油开发形成的污染要从加大技术革新和提高海洋石油...
A.
污染表现
B.
危害对象
C.
污染现状
D.
环保意识
【单选题】She ( ) the flat advertisement.
A.
has a problem with
B.
has a problem for
C.
has a problem of
【简答题】______________________________________ (如上所示 ), psychological health problem has arouse the whole world&39;s attention.
【单选题】It was in the year of 2008 _____ they set up the first branch company in China.
A.
which
B.
that
C.
as
D.
what
【简答题】阅读理解。 In London, there has always been a main problem. In order to solve this problem, the government has decided to have a bike revolution (革命). It has decided to provide 6,000 bikes for the people t...
【简答题】阅读理解。 In London, there has always been a main problem. In order to solve this problem, the government has decided to have a bike revolution (革命). It has decided to provide 6,000 bikes for the people t...
【简答题】The safety problem with mobile phones has_______________
【简答题】The government has never met a tougher problem.This is ____________.
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