题目

Then the mother of the living child came forward, for her heart went out to her son, and she said, O my lord, give her the child; do not ________ put it to death. A. on average                  B. on duty                 C. on any account         D. on the whole 答案：C某物体重为0.5N，把它放在盛有水的烧杯中，溢出重为0.3N的水，则它受到的浮力（ ）A．一定为0.3NB．可能为0.2NC．一定为0.5ND．可能为0.4N