乳腺增生病是佳的治疗方法是（）
A. * * 单纯切除
B.肿块局部切除
C.根治性 * * 切除
D.药物治疗
E.放射治疗
参考答案：D
I'm sorry that I can not accept your ________ to attend your birthday party, Linda, because I'm
________ to answer all the customers' letters tonight by my boss. [ ]
A. requirement; required
B. demand; requested
C. request; asked
D. request; required
下列（）是灰铸铁的牌号。
A.HT150
B.QT600-2
C.RuT260
D.以上答案都不对
