咳吐浊痰脓血，腥臭异常，可见于（）
A.白喉
B.顿咳
C.肺燥
D.肺痈
E.肺痿
参考答案：D
必须保证支架紧密接顶，初撑力达到（），顶板破碎时，必须擦顶移架。
A.23MPa
B.25MPa
C.24MPa
D.11.5MPa
I think he is a student, ______? [ ]
A. don't I
B. isn't he
C. is he
D. do I
