---What time is it?
---It’s ______ eight o’clock. [ ]
A. at
B. on
C. in
D. around
答案:D
我国大气污染的状况如何?
S6-NT本地MIC送话无声问题,与以下哪个器件关联性最大?()
A.R1713(普通电阻)
B.R1903(普通电阻)
C.L1700、L1701(普通电阻)
D.R2048(普通电阻)