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【单选题】
搬运是在同一场所内(通常指在某一个物流节点或码头等),对物品进行以( )为主的物流作业。
A.
水平移动
B.
垂直移动。
C.
水平和垂直移动
D.
倾翻作业
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举一反三
【单选题】氩弧焊采用直流反接时,()。
A.
焊件金属受电子高速冲击熔化慢
B.
钨极受电子高速冲击,造成钨极温度高,损耗快。
C.
没有阴极破碎作用
【简答题】关于女性内生殖器,下述哪项不对
【简答题】The dog plays outside. The dog is friendly.
【判断题】The IUPAC name of an alkene is derived from the name of the longest chain of carbon atoms that contains the double bond.
A.
正确
B.
错误
【单选题】铝、镁及其合金采用直流钨极氩弧焊时,不应该将钨极接在电源的正极上,其原因是()。
A.
避免钨极损耗过大
B.
容易产生气孔
C.
工件表面没有“阴极破碎”作用
D.
飞溅大
【简答题】Lucy has a dog. Dad gives the dog to her as a birthday present. She likes it very much. The dog is only five months old now. It is very cute and beautiful. Its color is white and its eyes are brown. T...
【简答题】什么是微格教学?有哪些特点?
【单选题】Why does the text imply that there are so many neighborhoods with houses that look similar?
A.
Buyers prefer them.
B.
They are cheaper to produce.
C.
A slow real estate market.
D.
Local building codes.
【简答题】Give an IUPAC substitutive name for each of the following alcohols:
【单选题】钨极氩弧焊采用( )时,没有“阴极破碎”作用。
A.
交流电源
B.
直流正接
C.
直流反接
D.
A或C
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