灭火用的二氧化碳通常是以()态灌装在耐压刚瓶内的。
A、气
B、固
C、液
D、混合
参考答案:C
We all knew from the very ______ that the plan would fail. Now you see it becomes true.
A.outbreak
B.outcome
C.outflow
D.outset
血液与组织细胞之间进行物质交换的场所是毛细血管( )