现测定某溶液中有K+、Ba2+、OH-,该溶液中可能还有的离子是 [ ]
A、Cl-
B、CO32-
C、SO42-
D .______________
A ;NO3-
A lot of people tried their best, but _______ people won the price. [ ]
A. a few
B. few
C. little
D. a little
大风天气桥吊司机在交班结束后应从()下机械,严禁乘坐电梯。
A、电梯
B、扶梯
C、以上都可