用一个质量可以忽略不计的薄塑料袋装满水,挂在弹簧测力计上,然后将其浸没在水中,则此时弹簧测力计读数 [ ]
A.小于袋中水重
B.等于袋中水重
C.大于袋中水重
D.等于零
答案:D
The sense of mistrust is compounded by smaller annoyances that leave the families feeling as though no one in authority cares about them.
A.offset
B.intensified
C.diminished
D.annulled
药物产生副作用的药理学基础是()
A、用药剂量过大
B、血药浓度过高
C、药物作用选择性低
D、患者肝肾功能不良