十二指肠溃疡病人上腹部疼痛的典型节律是()
A.疼痛-进食-缓解
B.进食-缓解-疼痛
C.缓解-疼痛-进食
D.进食-疼痛-缓解
E.疼痛-进食-疼痛
参考答案:A
— Do you know the girl _____ wears glasses?
— You don't know? She is our new classmate. [ ]
A. what
B. which
C. where
D. who
简述提高发动机动力性能指标和经济性能指标的基本途径?