对于DEA法为了减轻溶液的腐蚀性一般控制酸气负荷不超过（）摩尔酸气/摩尔DEA。
A、0.2
B、0.4
C、0.6
D、0.8
参考答案：B
Mr. Carter is a teacher. ____________ class is so much fun. [ ]
A. He
B. His
C. Her
严重的骨质疏松，冠心病等病症用拍法操作时用力宜轻。
