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【单选题】
建立工件坐标系时,在G54栏中输入X、Z的值是( )。A.
刀具对相对工件原点的距离
B.
刀具对在机床坐标系的坐标值
C.
工件原点相对机床原点的距离
D.
刀具对与机床参考点之间的距离
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反馈参考答案：
举一反三
【简答题】简述模拟通信系统的优缺点。
【多选题】What are two types of research？
A.
One research
B.
Primary research
C.
Two research
D.
Secondary research
【多选题】Which of the following statement is correct?
A.
Interest is expressed by maintaining eye contact witht the speaker, smiling, and nodding.
B.
Lack of interest or boredom is indicated by glancing repeatedly at your watch or staring at the ceiling or floor or out the window when the person is speaking.
C.
People of Indonesia smile a great deal, so Indonesia has been called "The Land of Smiles".
D.
The OK sign, with the thumb and forefinger joined to form a circle, is a positive gesture in US, although in Brazil it is considered obscene.
E.
Suspiciousness is indicated by making fisted gestures or crossing your legs.
【多选题】下列是复制保真性的机制( )
A.
DNA拓扑异构酶的异构作用
B.
半保留复制
C.
DNA聚合酶III的校读作用
D.
DNA聚合酶对碱基的选择作用
E.
反转录酶的作用
【多选题】What are the two types of IT communication?
A.
Phone
B.
Networked system.
C.
wireless
D.
Envelope
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