1000AH的蓄电池，用1小时率放电，其放电电流为：（）。
A.600~640
B.530~550
C.650~670
D.590~600
参考答案：B
It is pretty well understood _____ controls the flow of carbon dioxide in and out the atmosphere today. [ ]
A. that
B. when
C. what
D. how
