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一、托盘天平知识点习题第一部分:知识型题 1.用托盘天平称量药品,指针偏向左边,则表示 A.左盘重,砝码轻 B.左盘轻,砝码重 C.右盘重,砝码轻 D.右盘轻,药品重 2.托盘天平的左端放盛P_2O_5的表面皿,右端放盛晶体纯碱的表面皿,使两者质量相等,天平平衡。然后用玻璃钟罩把托盘天平罩上,经过一段时间后,观察到 A.天平仍然是平衡的 B.天平倾斜,左端向上,右端向下 C.五氧化二磷表面变湿润,晶体纯碱表面有白色
First, the tray balance knowledge points the first part: knowledge type questions 1. Weigh the drug with a tray scale, the pointer is biased to the left, it means A. left disk weight, weight light B. left disk light, weight C. right disk Weight, weight D. Right light, drug weight 2. Put the P_2O_5 watch glass on the left side of the tray balance and the crystal watch bowl on the right side so that the quality of the two is equal and the balance is balanced. Then use a glass bell to cover the tray balance. After a period of time, observe that A. Balance is still balanced. B. Balance tilted, left end up, right end down C. Phosphorus pentoxide surface became wet, crystal soda surface white