符合结节硬化型霍奇金淋巴瘤的特点为()
A.形成陷窝细胞
B.存在胶原纤维索
C.好发于年轻男性
D.典型R-S细胞多见
E.本型最常见
参考答案:A, B, D
—Whose bike is this?
—It ______ belong to Adam. Look! His bag is on it. [ ]
A. must
B. may
C. will
D. can
烟气脱硝改造配套进行的锅炉空预器改造,应遵循哪些原则?