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【单选题】
下列关于移液管和吸量管的使用错误的是
A.
使用前,移液管和吸量管都应该洗净,使整个内壁和下部的外壁不挂水珠,
B.
洗过的上下口放出均可。每次用水量:移液管以液面上升到球部或吸量管全长约1/5为宜
C.
移取溶液前,必须用吸水纸将尖端内外的水除去,然后用待吸溶液洗三次。
D.
放液时,松开右手食指,使溶液自由地沿壁流下。待液面下降到后,再等15秒钟取出移液管。
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参考答案:
举一反三
【单选题】下列各项中,不属于事业单位净资产的是( )。
A.
累计盈余
B.
权益法调整
C.
以前年度盈余调整
D.
非财政拨款结余分配
【简答题】现代计算机在性能等方面发展迅速,但是 1 并没有发生变化。计算机采用了两项重要的技术 2 ,因而能高效、自动地连续进行数据处理。
【单选题】The passage suggests that______
A.
to make the hostess happy you should ask for more food even if you are full
B.
you should keep silent at a dinner table in order to be polite
C.
if you want to be friendly with the person next to you, you should press food on him
D.
talking is necessary at a dinner table
【单选题】根据《劳动合同法》第四十条规定,下列(   )情形中,用人单位须提前30天以书面形式通知劳动者本人或者额外支付劳动者一个月工资,可以解除劳动合同。
A.
劳动者患病或者非因工负伤,在规定的医疗期满后不能从事原工作,也不能从事由用人单位另行安排的工作的
B.
劳动合同订立时所依据的客观情况发生重大变化,致使劳动合同无法履行,经用人单位与劳动者协商,未能就变更劳动合同内容达成协议的
C.
劳动者同时与其他用人单位建立劳动关系,对完成本单位的工作任务造成严重影响,或者经用人单位提出,拒不改正的
D.
企业生产经营发生严重困难的
【单选题】The result of Holmes-Rahe's medical research tells us ______.
A.
the way you handle major events may cause stress
B.
what should be done to avoid stress
C.
what kinds of events would cause stress
D.
how to cope with sudden changes in life
【简答题】Many of us don't pay much attention to the importance of eye care. It is said that if you take care of your body, then you can surely be healthy. That is why our eyes should be given a lot of care. Na...
【简答题】Task 1 Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 to 40. For each question or statement there are 4 choices marked A), B), C) and ...
【简答题】根据资料计算调节后银行存款余额
【单选题】10mol/L Na 3 PO 4 溶液 , 其离子强度为
A.
0.10mol/L
B.
0.30mol/L
C.
0.40mol/L
D.
0.60mol/L
【单选题】—  You know I'm having a hard time now. — Needn't worry. If you can______ the present difficulties,everything should be all right. [     ]
A.
get away
B.
get over
C.
get off
D.
get on
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