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【单选题】
手弧焊接时，焊接电源的种类应根据( )进行选择。A.
焊条直径
B.
焊条性质
C.
焊条材质
D.
焊件厚度
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反馈参考答案：
举一反三
【简答题】基于因特网技术的商务活动称为( )商务。
【简答题】均匀化退火的目的在于消除有害的()，改善某些可以溶入固溶体的夹杂物的状态，从而使钢的组织与性能趋于均一。
【单选题】Over the long process of evolution, animals have developed their ______ senses, which makes it p
A.
14. Over the long process of evolution, animals have developed their ______ senses, which makes it possible for them to _____ their environments. A．specially; conquer
B.
unique; survive
C.
uniquely; survive
D.
special; exist
【简答题】疼痛是一种令人苦恼、（）的主观感觉，是人的健康受到（）的信号。
【单选题】Animal Intelce Are Animals intelt? If they are, which animals are the most intelt? These are not easy questions to answer. In the first place, no one is quite sure what intelce is....
B.
Chimpanzees can solve certain problems without any help.
C.
Some animals seem able to do this.
D.
In all these cases we may say that an animal is using intelce.
E.
In other words, he did not simply use a tool, which itself is intelt: he made a tool.
F.
They do not remember places and directions and then make decisions.
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