在国内需求因素中,消费倾向比较稳定,国民收入波动主要来自( )的变动。
A.国际经济环境B.投资C.消费D.政府政策
参考答案:B
接团前,全陪应提前同接待社取得联系,妥善安排相关事宜( )。
A.2小时
B.12小时
C.24小时
D.48小时
Robots came into the world as a literary device whereby the writers and film-makers of the early 20th century could explore their hopes and fears about technology, as the era of the automobile, telephone and aeroplane picked up its reckless jazz-age speed. Since moving from the page and screen to real life, robots have been a mild disappointment. They do some things that humans cannot do themselves, like exploring Mars, and a host of things people do not much want to do, like dealing with unexploded bombs or vacuuming floors. And they are very useful in bits of manufacturing. But reliable robots-especially ones required to work beyond the safety cages of a factory floor—have proved hard to make, and robots are still pretty stupid. So although they fascinate people, they have not yet made much of a mark on the world. That seems about to change. The dramatic growth in the power of silicon chips, digital sensors and high bandwidth communications improves robots just as it improves all sorts of other products.