皮皮学，免费搜题
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【单选题】
用坐标镗加工，其表面粗糙度可达A.
Ra= 0.8
B.
Ra=0.4
C.
Ra=1.6
D.
Ra=1.2
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皮皮学刷刷变学霸
举一反三
【单选题】If you are interested in any one of the books on the shelf ,I’ll buy and send _________ to you as a gift．
A.
it
B.
one
C.
them
D.
some
【单选题】听力原文：If you are interested, I can arrange a meeting for you to meet our technicians to give you an overall understanding of our new products. (24)
A.
I am interested in your new techniques and I want to make an appointment.
B.
I want to talk to our technician to see if he is interested in your new products.
C.
I can ask some of our staff to give you information about our new products.
D.
I hope you understand that I have to attend a meeting about our new products.
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