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【简答题】
指出下列各种误差是系统误差还是偶然误差?如果是系统误差,请区别方法误差、仪器和试剂误差或操作误差,并给出它们的减免方法。 1 砝码受腐蚀; 2天平的两臂不等长 ; 3 容量瓶与移液管未经校准; 4在重量分析中,试样的非被测组分被共沉淀; 5 试剂含被测组分:系统误差 ( 试剂误差 ) ; 6试样在称量过程中吸潮 ; 7 化学计量点不在指示剂的变色范围内; 8读取滴定管读数时,最后一位数字估计不准; 9在分光光度法测定中,波长指示器所示波长与实际波长不符; 10在 HPLC 测定中,待测组分峰与相邻杂质峰部分重叠。
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皮皮学刷刷变学霸
举一反三
【简答题】给小动物排排队． （1）按从大到小的顺序排列． 4.2，4.02，4.42，4.24，4.04； ______＞______＞______＞______＞______ （2）按从小到大的顺序排列． 5.01，0.51，0.15，1.05，1.50 ______＜______＜______＜______＜______．
【简答题】为什么说改革是一场新的革命，是社会主义制度的自我完善和发展?
【单选题】Who will work out the plan to build the house?
A.
The builder alone.
B.
The owner of the house.
C.
All the family members.
D.
The owner and the builder together.
【单选题】Task 2 Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45. Peter Fern was mad on mountains. Climbing was the love of his life. Church towe...
A.
he enjoyed to climb mountains
B.
he was angry on mountains
C.
he lost his senses on mountains
D.
he enjoyed climbing mountains very much
【单选题】Task 2 Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45. Peter Judd joined the army when he was 18, and for several months he was taught...
A.
In order to be a good soldier.
B.
In order to be good at shooting.
C.
In order to make friends.
D.
We don't know.
【单选题】碱中毒患者易出现手足抽搐的主要原因是
A.
血清Na + 减少
B.
血清游离Ca ++ 减少
C.
血清Cl — 减少
D.
血清K + 减少
E.
血清Mg ++ 减少
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