对铝合金损伤表面进行铬酸抑制剂处理的铬酸水溶液的浓度是：（）.
A.百分之五
B.百分之十
C.百分之十五
D.百分之三
参考答案：B
_____ to complete the job on time, they set out to work immediately. [ ]
A. Being determined
B. On having determined
C. Determined
D. To be determined
下列是苯醌类药物的是
A．放线菌素
B．丝裂霉素C
C．阿毒素
D．头胞菌素
E．青霉素
