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【简答题】
、四相步进电机的步距角为: ;常用三相步进电机步距角为: 。
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【单选题】What does the author think of the American youth?
A.
Disappointed.
B.
Excited.
C.
Worrisome.
D.
Satisfied.
【单选题】在 Word2007 中,下列关于页眉、页脚的叙述错误的是 ( ) 。
A.
文档内容和页眉、页脚可以在同一窗口编辑
B.
文档内容和页眉、页脚将一一起打印
C.
奇偶页可以分别设置不同的页眉、页脚
D.
页眉、页脚中也可以进行格式设置或插入剪贴画
【简答题】定轴轮系总传动比的正负号，决定于外啮合齿轮的（），正号表示主动轮、从动轮转向（），负号表示它们的转向（）。
【单选题】According to Frank Roberto, what is the difficulty for American researchers' mass-production of mussel glue?
A.
The gene number that is known is not enough.
B.
Mussels are much smarter than we think.
C.
They can't copy the blend of proteins of mussel.
D.
Mussels have an amazing power harmful to man.
【简答题】What does Roberto look like? He has black hair and brown eyes.
【单选题】What does the professor imply about the rooms inside the homes of today?
A.
They have the same functions as those in ancient homes.
B.
They are more often round than box- shaped.
C.
They are arranged to progress from public to private.
D.
They are forbidden to any person outside the family.
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