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The problem of waste is becoming more and more common, so we must control (控制) it. Every day, a lot of 1 goes uneaten (没吃的) and ends up in the trash, while many people in developing countries cannot even afford to have one meal every day. The next time you 2 to a delicious dinner, ask yourself,“How much food 3 I eat?" If you think about only taking as much as you are able to eat, it will help you cut 4 on waste. The problem of waste happens all over the world. People often consume (消费) 5 than they really need. This often results in waste and it can be a big 6 . However,there are many things that we can do 7 cut down on trash and waste. The most important thing to remember is to be friendly to the environment. Only take as much as you can eat, don't buy things you 8 need, and leave litter in its proper (恰当的) place. 9 every person could cut down on waste in daily lives, even just 10 , the whole result would be great. We know that many restaurants have joined the“clear your plate" campaign against wasting food. We students should do the same in our daily life, especially when having dinner with our friends and relatives.
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【简答题】(7分)实验室配制480 mL 0.1mol·L -1 NaOH溶液,回答下列问题 (1)应用托盘天平称取氢氧化钠固体 ▲ g。 (2)配制NaOH溶液时需用的主要仪器有托盘天平、药匙、烧杯、玻璃棒、量筒、 ▲ 。 (3)若实验遇下列情况,则所配溶液的物质的量浓度是  A、偏高  B、偏低  C、不变(用符号回答) ①定容时俯视刻度线 ▲ ; ②放在滤纸上称量NaOH固体 ▲ 。 (4)请你帮助把...
【单选题】配制0.1mol/L NaOH标准溶液,下列配制错误的是()。(M=40g/mol)
A.
将NaOH配制成饱和溶液,贮于聚乙烯塑料瓶中,密封放置至溶液清亮,取清液5mL注入1L不含CO 2 的水中摇匀,贮于无色剂瓶中
B.
将4.02克NaOH溶于1L水中,加热搅拌,贮于磨口瓶中
C.
4克NaOH溶于1L水中,加热搅拌,贮于无色试剂瓶中
D.
将2克NaOH溶于500mL水中,加热搅拌,贮于无色试剂瓶中
【单选题】欲使导通晶闸管关断,错误的做法是( )。
A.
阳极阶段加反向电压
B.
撤去门极电压
C.
减小阴极电流,使其小于维持电流
D.
将阳极阴极闸电压减小至小于维持电压
【单选题】Which of the following BEST explains what the global community should do?
A.
To supervise the construction of schools.
B.
To take prompt and effective actions.
C.
To provide water and power supply.
D.
To prevent instability and aggression.
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A.
阳极阴极间加反向电压
B.
将阳极阴极间正压减小至小于维持电压
C.
撤去门极电压
D.
减小阴极电流,使其小于维持电压
【单选题】Don’t throw away the waste paper. It needs so that it can be reused.
A.
to destroy
B.
destroying
C.
to collect
D.
colleting
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【单选题】欲使导通晶闸管关断,错误的做法是( )。
A.
阳极阴极间加反向电压
B.
撤去门极电压
C.
将阳极阴极间正压减小至小于维持电压
D.
减小阴极电流,使其小于维持电流
【多选题】确定再订货点时,需要考虑的因素有( )。
A.
经济订货批量
B.
每日耗用材料数量
C.
材料的在途时间
D.
每次的订货成本
【多选题】确定再订货点时,需要考虑的因素有(    )。
A.
经济订货批量    
B.
每天消耗的原材料数量
C.
原材料的在途时间    
D.
每次的订货成本
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