已知C、D在直线AB上,那么直线AB上的射线有( )A.6条B.7条C.8条D

题型:选择题

问题:

已知C、D在直线AB上,那么直线AB上的射线有(   )
A.6条
B.7条
C.8条
D.9条
考点:直线,线段,射线
题型:选择题

概括弯制卡环转弯的要点正确的是()

A.三定一控制

B.三定二控制

C.二定一控制

D.二定二控制

E.一定三控制

题型:选择题

制订投资方针和政策是组合投资管理的( )。

A.第一步

B.第二步

C.第三步

D.第四步

题型:选择题

岩土工程勘察成果报告应附以下( )图件。

A.室内试验成果图表

B.原位测试成果图表

C.工程地质柱状图

D.工程地质剖面图

E.勘探点平面布置图

题型:选择题

Looking back on my childhood, I am convinced (1) naturalists are born and not made. Although we were all brought (2) in the same way, my brothers and sisters soon gave up their pressed flowers and insects. (3) them, I had no ear (4) music and languages, I was not an early reader and I could not do mental arithmetic.Before World War I we (5) our summer holidays in Hungary. I have only the memory of the house we lived (6) , of my room and my toys. I can hardly (7) clearly the large family of grandparents, aunts, uncles and cousins who gathered (8) door. But I do have a clear memory of the dogs, the farm (9) , the local birds and, (10) all, the insects.I am a (11) , not a scientist. I have a p (12) of the natural world, and my enthusiasm has led me into varied investigation. I love discussing my favorite topics and enjoy (13)  the midnight oil  (14)  reading about other people’s observations and discoveries. Then  (15)  happens that brings these observations together  (16)  my conscious mind. Suddenly you fancy (想象), you see the answer  (17)  the riddle, and books, of which some might honor with the title of scientific research.But curiosity, a keen eye, a good memory and enjoyment of the animal and plant world do not make a scientist; one of the outstanding and essential  (18)  required is self-discipline, a quality I lack. A scientist requires not only  (19)  but also hard training, determination and a goal. A scientist, up to a point, can be made. A naturalist is  (20) . If you can combine the two, you get the best of both worlds.

 

第(12)空应选择()

A.wish

B.eagerness

C.imagination

D.love

题型:选择题

多级投棒技术,可以根据夹层的大小,选择不同的()。

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