【单选题】According to Paragraph 3, what can be inferred about three-field system?
A.
It increased productivity but was more labor intensive.
B.
It made crops less vulnerable to weather conditions.
C.
It spread from the Mediterranean to the rest of Europe.
D.
It was suitable in regions that had richer soil.
【单选题】容器中装有质量为 M =8 × 10 -3 kg 的氧气(刚性双原子气体),温度为 300K ,则氧气的内能为(普适气体常量 R =8.31J · mol -1 · K -1 )
【判断题】我国古代传统上,多以地名来命名窑口。()
【简答题】用强酸滴定强碱时,滴定曲线的突跃范围大小与 有关
【单选题】1912年成立的中华民国南京临时政府被称为亚洲第一个“美国式”的共和国,其主要原因是这一政权