患儿男,12岁。CT示松果体区肿瘤,内有点状钙化,肿瘤和侧脑室室管膜增强,诊断为()
A.松果体瘤
B.生殖细胞瘤
C.畸胎瘤
D.转移瘤
E.室管膜瘤
参考答案:B
The story that happened 30 years ago still remains ____ in my mind as if it _____ yesterday. [ ]
A. clean; happened
B. fresh; happened
C. clear; was happened
D. clearly; happened
为使混凝土不发生离析现象,当浇筑高度超过()时,应采用串筒、溜管或振动溜管使混凝土下落。
A.3m
B.4m
C.5m
D.6m