POP3与IMAP4相比，POP3应用（）。
A.更少
B.一样多
C.更广泛
D.以上答案都不对
参考答案：C
According to the passage, which of the following is the most severely criticized function of the mass media a. The function to influence. b. The watchdog function. c. The function to advertise. d. The function to inform.
对测量值标准不确定度的B类评定，一般先估计它的（），再取UB(x)=
