单项选择题
It is Henry Ford's belief that （）
A．products should be made with less cost but higher efficiency B．products should be sold at low prices in large quantity C．products should be sold at high prices in large quantity D．standards must be established in his plants
单项选择题 The example of Henry Ford's attitudes towards competition was used to illustrate （）
单项选择题 Laser-doppler radar is especially valuable in space missions because （）
单项选择题 Laser-doppler radar（）
