患者女性,来诊时见颈部肿块。
若为弥漫性肿大,边缘不清,随吞咽上下移动,诊为()
A.气瘿
B.肉瘿
C.筋瘿
D.瘿痈
E.石瘿
参考答案:A
More than _______ of the classmates in my class ____ fond of pop music.
A.two-third, is
B.two-thirds, is
C.second-third, are
D.two-thirds, are
在学生表中要查找所有年龄小于20岁且姓王的男生,应采用的关系运算是( )。
A.选择 B.投影C.连接 D.比较