一头牛是500千克,______头牛是一吨.
1吨=1000千克,
1000÷500=2(头);
答:2头牛是1吨.
故答案为:2.
— Do you know ______ the Capital Museum?
— Next Friday. [ ]
A. when will they visit
B. when they will visit
C. when did they visit
D. when they visited
关于脾脏的表述,错误的是()
A.位于左季肋部
B.上缘前部有2~3个脾切迹
C.是腹膜间位器官
D.贴于膈肌穹窿下面
E.脏面近中央处有脾门