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回答下列各题: Looking back on my childhood,I am convinced thatnaturalists are born and not made.Al-though we werebwught up in the same way,my bwthers and sisters soonabandoned theirpressed flowers and insects.Unlike them,I had no ear for music and languages.I wasnot anearly reader and I could not do mental arithmetic. Before World War I we spent our summerholidays in Hungary.I have only the dim memry 0f tlle house we lived in,of my room and my toys.Nor do I recallclearly the large family ofgrandparents,aunts,uncles and cousins who gathered next door.ButI do have a crystalclearmemory of the dogs,the farmanimals,the local birds,andabove all,the insects. I am a naturalist,not a scientist.I have a strong love of the natural world and my enthusiasmhad ledme into varied investigations.I love discussing myfavorite topics and enjoy burning themidnight oil while reading about otherpeople’s observations and discoveries.Then somethinghap-pens that brings these observations together in my conscious mind.Suddenly you fancy you flee theanswer to the riddie,because it all seems to fit together.Thishas resulted in my publishing 300 -pets,and books,which some might honour with the title of scientific research. But curiosity,a keen eye,a goodmemory and enjoyment of the animal and plant world donot make a scientist:one the outstanding and essential qualities required isself-discipline,aquality I lack.A scientist requires not only self-discipline but hard training,determination anda goal.A scientist,up to a point,can be made.A naturalist is born.If you can combinethetwo,you get the best of both wodds. The author can’t remember his relativesclearly because_________.
A.
he was too young when helived with them
B.
he was fully occupied withobserving nature.
C.
he didn’t live very longwith them
D.
the family was extremelylarge
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【单选题】国际收支平衡表中的人为项目是:
A.
经常项目
B.
资本和金融项目
C.
综合项目
D.
错误和遗漏项目
【单选题】国际收支平衡表中的人为项目是( )
A.
综合项目
B.
资本和金融项目
C.
经常项目
D.
错误与遗漏项目
【单选题】国际收支平衡表中的人为项目是?
A.
Current account
B.
Capital and Financial account
C.
Capital transfer
D.
Errors and Omissions
【单选题】有一正弦电流,其初相位φ=30o,初始电流i0=10A,则该电流幅值Im为()
A.
10√2
B.
20
C.
10
D.
不确定
【多选题】在酯化后进行产物分离时可以通过下列哪些方式实现的()
A.
料醇与生成水共沸蒸除
B.
成酯与水共沸蒸除
C.
出生成酯
D.
成酯与原料醇共沸蒸除
【多选题】在酯化后进行产物分离时可以通过下列哪些方式实现的()
A.
原料醇与生成水共沸蒸除
B.
生成酯与水共沸蒸除
C.
蒸出生成酯
D.
生成酯与原料醇共沸蒸除
【单选题】选择齿轮的结构形式和毛坯获得的方法与 ( ) 有关 。
A.
齿轮在轴上的位置
B.
齿轮直径
C.
齿圈宽度
D.
齿轮精度
【单选题】具有安胎作用的化湿药是
A.
苍术
B.
紫苏
C.
砂仁
D.
豆蔻
E.
厚朴
【单选题】国际收支平衡表中的人为项目是:
A.
经常项目
B.
资本和金融项目
C.
综合项目
D.
错误与遗漏项目
【单选题】国际收支平衡表中的人为项目是
A.
经常项目
B.
资本项目
C.
基本项目
D.
错误与遗漏
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