正常龈沟探诊深度是（）
A.≤0.5mm
B.≤lmm
C.≤2mm
D.2~3mm
E.≤3mm
参考答案：D
_____ was most important to her, she told me, was her family. [ ]
A. It
B. This
C. What
D. As
LTE系统在一个子载波带宽内的系统底噪约为（）dBm，取子载波间隔为15kHz，系统噪声系数NF为4。
A.130
B.128
C.125
D.120
