为保证可靠的压紧，螺纹孔的深度比螺杆的旋入长度多0.5d。
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founder
A. a refusal to accept, hire, or buy
B. related to government control of social and economic activity
C. a person who starts a company
born with a silver spoon in one’s mouth
A. to be born into a wealthy family
B. the changing of words into a different language
C. a person who promotes and represents an idea, product, or business
rejection
A. a refusal to accept, hire, or buy
B. related to government control
C. to be born into a wealthy family
e-commerce
A. to provide opportunities
B. business that takes place over the internet
C. to be born into a wealthy family
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