根据斜面的道理,我们可以得出结论,螺旋的杆子越(),螺距越小越省力。A、粗 B、细

题型:单项选择题

问题:

根据斜面的道理,我们可以得出结论,螺旋的杆子越(),螺距越小越省力。

A、粗

B、细

C、长

D、短

考点:职称计算机考试教师职称计算机考试教师职称计算机考试题库
题型:单项选择题

冻结对食品组织结构的影响主要集中在机械性的损伤、()和()。

题型:单项选择题

根据《建筑安装工程费用项目组成》文件的规定,对构件和建筑安装物进行一般鉴定和检查所发生的费用列入( )。

A.材料费

B.其他直接费

C.措施费

D.研究试验费

题型:单项选择题

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(5)空应选择()

A.spent

B.purchased

C.wounded

D.burnt

题型:单项选择题

甲欠乙债务1000万元,丙以一栋违法建筑提供抵押,乙明知其为一违法建筑而予以接受,后甲偿还600万元,余下债务不能偿还,而该抵押合同被宣告无效,则丙承担的赔偿责任最高是( )。

A.1000万元

B.600万元

C.400万元

D.200万元

题型:单项选择题

立式车床工作平稳性好,可较长时间地保证车床的工作精度。

更多题库