若进行下列检查,可能出现异常的是
A.血糖B.尿比重C.甲状腺功能D.肾功能E.肝功能
参考答案:B
— I wonder if you can go shopping with me together.
— Sorry. I _____ a letter all the morning and haven't finished it yet. [ ]
A. am writing
B. was writing
C. have written
D. have been writing
我国数字微波通信系统的中频频率一般选用()。
A.140MHz、70Mz;
B.100MHz;
C.10MHz;
D.35MHz