CODcR测定仪暂停使用时，应用（）彻底清洗后排空。
A.自来水
B.蒸馏水
C.CODcR标准溶液
D.新试剂
参考答案：B
There is only _______ water left. Shall we go and buy some?[ ]
A. little
B. a little
C. few
D. a few
儿童房的设计原则有哪些？
