【单选题】某元素的原子核外有3个电子层,最外层有6个电子,该原子核内的质子数为( )
【单选题】泰勒的科学管理原理的理论基础是亚当·斯密提出的()
【单选题】In the first decade( )was welcomed to the technical world.
【判断题】世界上第一台电子数字计算机ENIAC是真空管计算机。The world's first electronic digital computer, ENIAC, was a vacuum tube computer.(True or Flase)
【判断题】高素质人才的获取和开发,是现代企业可持续发展的关键
【单选题】泰勒的科学管理原理的理论基础是亚当·斯密提出的( )
【单选题】The tube, London's underground system, _______.
A.
has two hundred stations and seventy lines
B.
reaches every corner of the city
C.
was the first underground railway system in the world
【单选题】about ENIAC ’ s description the wrong is ( )
A.
ENIAC was made in America in 1946
B.
it used tube and transistor
C.
It is the first electronic computer to use stored program and program control to work automatically.
D.
Its main purpose is to calculate trajectory.
【简答题】花生四烯酸是______。 (A)十八碳三烯酸 (B)十八碳二烯酸 (C)二十二碳六烯酸 (D)二十碳四烯酸