哪种情况下PETCO2明显低于PaCO2 ["A．高频通气","B．低心排血量","C．过度通气","D．心跳骤停","E．休克"] 不参加腕关节构成的骨是（） ["A．手舟骨","B．月骨","C．三角骨","D．豌豆骨","E．桡骨下端"] 腕关节不能作（） ["A．前屈运动","B．外展运动","C．内收运动","D．后伸运动","E．旋转运动"] 肘关节（） ["A．由肱桡、肱尺两个关节组成","B．关节囊两侧松驰，前后紧张","C．可作内收和外展运动","D．肱尺关节可作旋前、旋后运动","E．以上都不对"] 钠石灰失效的特征是 ["A．变色","B．质地变硬","C．吸收罐不发热","D．患者出现二氧化碳蓄积的症状","E．气道压升高"] 理想气体方程PV=MRT／u用于实际气体时，下列哪些情况会导致偏差增加