如图所示的格构式轴压杆，ιox=ιoy=5890mm，λy=60，λl=25，确定分肢间距离的依据是（）。
A.A
B.B
C.C
D.D
参考答案：D
简述各种通信介质的优缺点。
She is ______ going out alone in the evening. [ ]
A. nervous of
B. afraid of
C. angry with
D. can't wait
id of