多项选择题粪便隐血试验阳性可见于：（ ） A、消化道出血 B、摄入肉类 C、服用维生素C D、服用铁剂 E、服用铋剂
单项选择题For a short channel MOS transistor, the raising of the VDS increases the width of the drain-junction depletion region, threshold voltage increases consequently.
