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Passage A Quality Time You ’ ve just been given a major task and want to do it well, but it seems that the minute you get started, you ’ re interrupted. First, jane stops by. Then, it ’ s the phone. Later, your boss tells you to drop everything – she ’ s got a rush job. And you have that meeting at there! All these things are important. If only you could rearrange them without breaking your concentration. And you can! We ’ ve heard about quality time at home – why not quality time on the job? Begin by finding out those parts of the day during which you ’ re most creative. You may work best in the morning or in the afternoon. No matter when – just find your time and build a wall around it. Say that for you, quality time begins at ten. Focus on your major task then, and don ’ t let anything interrupt you. If you have a secretary, tell her or him to hold all calls and visitors; if you don ’ t, try to ask a colleague to help you. The point is that both outsiders and colleagues will know that you will not be available for a part of each day. Why? Because you are working! Prepare for this special block of time as carefully as you would for an important meeting. Don ’ t waste precious minutes searching for memos or notes. Be ready to begin precisely at ten, and get the most out of every second. You might like to use your block simply for thinking about a project, problem or a new idea. Start small – maybe thirty or forty minutes, three times a week, building up to at least an hour, Sure, you ’ ll have to chip away at your block a little sometimes, but guard that hour as you would do to any other valued possession.
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【单选题】对于测定氨氮的水样,预处理的方法是什么?( )
A.
蒸馏法
B.
微波消解法
C.
气提法
D.
萃取法
【简答题】水中的氨氮是指以()(或称非离子氨,NH 3 )和()(NH 4 + )形式存在的氮。两者的组成决定于水的pH值。pH偏高时,游离氨;pH偏低时,()。测定水中氨氮的方法:():需作相应预处理;():需作相应预处理;():比较简单,使用专用仪器或原子吸收分光光度计测定均可获得良好效果;():通常不需要对水样进行预处理,但再现性和电极寿命尚存在一些问题;():用于氨氮含量较高的水样。
【单选题】NaF 、 NaCl 、 MgO 、 CaO 晶格能大小的次序正确的是( )
A.
NaCl
B.
NaCl
C.
NaF
D.
MgO 。
【单选题】关于晶格能,下列说法中正确的是
A.
晶格能是指气态阳离子与气态阴离子生成1 mol离子晶体所释放的能量
B.
晶格能是由单质化合成1 mol离子化合物时所释放的能量
C.
晶格能是指气态阳离子与气态阴离子生成离子晶体所释放的能量
D.
晶格能就是组成离子晶体时,离子键的键能
【简答题】什么是晶格能?决定晶格能大小的主要因素是什么?
【单选题】下列晶格能大小顺序中正确的是()
A.
CaO>KCl>MgO>NaCl
B.
.NaCl>KCl>RbCl>SrO
C.
MgO>RbCl>SrO>BaO
D.
MgO>NaCl>KCl>RbCl
【单选题】下列关于晶格能的说法中正确的是 ( )
A.
晶格能指形成1 mol离子键所放出的能量
B.
晶格能指破坏1 mol离子键所吸收的能量
C.
晶格能指由气态阴离子和气态阳离子相结合生成1 mol离子晶体时所放出的能量
D.
晶格能的大小与晶体的熔点、硬度都无关
【单选题】下列大小关系正确的是()A.熔点:NaI>NaBrB.硬度:MgO>CaOC.晶格能:NaCl NaCl
A.
下列大小关系正确的是    (    ) A.熔点:NaI>NaBr
B.
硬度:MgO>CaO
C.
晶格能:NaCl
D.
熔沸点:CO 2 >NaCl
【单选题】急性单纯性胆囊炎一般不采用下列哪项治疗措施:
A.
禁食
B.
胆囊切除术
C.
胃肠减压
D.
抗感染
【单选题】下列晶格能大小的次序正确的是( )
A.
NaCl
B.
NaCl
C.
NaF
D.
MgO
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