ZXMP-S385光板正常上电后如果本光口激光器发光灯灭,通常可能由于().
A.激光器为关断状态
B.单板软件异常
C.用户设置ALS
D.无时钟锁定源
参考答案:A, C
There are a great many books in the store, some are useful to us. [ ]
A. of them
B. in which
C. of which
D. in them
中国古代关于政治的研究主要围绕君主的()而展开。
A.治臣之道
B.治民之术
C.合法性
D.治国之道