铣削奇数齿矩形牙嵌离合器时，经过第（）进给铣削后，可铣出第一个齿形。
A.Z
B.Z-1/2
C.Z+1/2
参考答案：C
My hobby is changing all the time. Now I am _______ in collecting coins. It’s_______ and valuable.
A. interesting; interested B. interested; interesting C. interested; interest
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