正断层的上盘相对于下盘（）滑动，断层面倾角一般（）。大型正断层断层面产状一般（）。
参考答案：向下，较陡，上陡下缓
His glasses, ____ he could see nothing, fell on the ground and broke. [ ]
A. without which
B. with which
C. for which
D. by which
福州的NAVTEX播发台的识别码字母为（）
A、N
B、R
C、O
D、M
