[问答题,简答题] 何谓食品等值交换份?

正常人一般左肺由几个肺段组成() ["A．7","B．8","C．9","D．10","E．11"] 何谓优质蛋白质? 背部疼痛可发生于() ["A．胰腺癌","B．球后溃疡","C．幽门梗阻","D．穿透性溃疡"] 癌骨转移后引发剧烈疼痛的可能原因有() ["A．癌瘤分泌前列腺素","B．压迫神经根","C．侵蚀交感神经","D．侵蚀软组织","E．血管侵蚀引起缺血"] 平衡膳食 何谓食品等值交换份?