下列纬线中,最长的一条是
A:80°S
B:60°S
C:32°N
D:12°S
高铁酸钾(K2FeO4)具有强氧化性,是一种新型多功能水处理剂,其生产工艺流程如下:
已知:K2FeO4在水溶液中易发生反应:4FeO42﹣+10H2O⇌4Fe(OH)3+8OH﹣+3O2↑,下列说法不正确的是( )
胚胎发育到60天左右,已初具人形,从这时起直到出生以前的胚胎习惯上称为胎儿。( )
Nowadays, cycling, along with jogging and swimming, _______ as one of the best all-round forms of exercise.