【简答题】滚动轴承的核心元件是(),它使相对运动表面间的滑动摩擦变为滚动摩擦。
【判断题】纵向协调模式是指有隶属关系的上下级间的协调
【单选题】What is the main idea of Para 5-7(last three paragraphs)?
A.
DNA's future tendencies.
【单选题】(Para 7)It's been six years since he _____ from college.
【简答题】滚动轴承的核心元件是滚动体,它使相对运动表面间的滑动摩擦变为()。
【单选题】According to 'the Queen's Golden Jubilee' (Para.3), how long has been the reign of the Queen?
A.
It has to be 25 years under the reign of the Queen.
B.
45 years should be the minimum for the Queen's Golden Jubilee.
C.
At her age of 50, people usually celebrate the Queen's Golden Jubilee.
D.
The Queen's Golden Jubilee would be celebrated at her 50 year's reign.
【单选题】关于甲、乙两牧区畜产品生产和销售特点的叙述,正确的是( )
A.
甲牧区产品主要面向国际市场;乙牧区产品主要面向国内市场
B.
甲牧区主要为城市提供肉、奶、禽、蛋等;乙牧区主要出口羊肉到北美
C.
甲牧区产品主要靠铁路运输;乙牧区产品主要靠航空运输
D.
甲牧区生产依赖天然草场,“超载放牧”严重;乙牧区种植饲料作物或牧草,补充天然牧草的不足