when demand for a factory's products is high, more money is spent at the factory for safety precautious and machinery maintencance thant when demand is low. Thus the average number of on-the-job accidents per employee each month should be lower during periods when demand is high than demand is low and less money is available for safety precaustions and machinery maintenance. which of the followig, if true about a factory when demand for its product its high, casts the most serious doubt in the conclusion draw above ? 答案是B~ Its management hires new workers but lacks the time to train them properly. 我想问NN们~这是个什么类型的削弱啊？~给出他因？~是因果关系的削弱吗？~ | 
