Though it was late, _____ he went on with his work. [ ]
A. but
B. and
C. so
D. \
答案:D
国家权力机关有权对公安工作中的违法违纪行为提出议案,要求公安机关报告有关情况,改正错误及不适当的行为。( )
地下水开采量评价方法有几种?