中度出汗的患者,丧失体液约:()
A.300~8 000 ml
B.500~8 000 ml
C.500~1 000 ml
D.800~1 200 ml
参考答案:C
The boy writes __________his friend every week.[ ]
A. to
B. on
C. in
D. at
设有下列二叉树:
对此二叉树中序遍历的结果为 ( )