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【单选题】
对于一个物体系统来说，在下列条件中，哪种情况下系统的机械能守恒?A.
合外力为 0
B.
合外力不做功
C.
外力和非保守内力都不做功
D.
外力和保守力都不做功
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【单选题】患者，女，40岁，急性CO中毒1天后送医院。神志不清，双瞳孔等大等圆，对光反射减弱，两肺呼吸音粗，心率80次/分，律齐，腹部无异常体征，病理反射（-），体温正常，对该患者的下一步急救应
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E.
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