—Do you know where coffee was from first?
—It was said that coffee ______in Africa a long, long time ago.
A:discovered
B:invented
C:was invented
D:was discovered
二氧化碳、尿素、多余水分排出体外的过程叫排泄.(判断对错)
近几年,我国东部沿海地区一些工厂逐渐用机器人代替手工生产,今年春节刚过,江西某村外出务工人员集体被同一家工厂辞退。关于我国东部沿海地区一些工厂逐步推广机器人替代手工原因的分析,错误的是( )
某品牌饮用水标签标明了该水中钠、钾、钙等的含量,这里的钠、钾、钙等是指( )