硫化氢中的硫的化合价为（）。
A、-3
B、-1
C、-2
D、+2
参考答案：C
中兴设备ZXWM-M900/ZXWM-32为保证网元监控的有效性，NCP板的时间应与网管服务器的时间有什么要求？
Joined by their friends, Troy and Carmella staged a musical _____ their experiences, hopes and fears about
the future. [ ]
A. reflecting
B. reflected
C. being reflected
D. having reflected
