13号、13A型钩尾框补充新品时须为（）型；17型钩尾框补充新品时须为锻造钩尾框。
A.13A
B.13B
C.13号
参考答案：B
Both Jim and Kate _____ in Beijing now. They both _____ from America. [ ]
A. is; come
B. are; come
C. is; comes
D. are; comes
心肌细胞不会发生（）
A.肥大
B.萎缩
C.增生
D.变性
E.坏死
