催化剂活性好，则转换率（）。
A、高
B、低
C、不变
参考答案：A
Although you have lots of difficulties, you must _______your work.
A．carry on with
B．carry out with
C．carry away on
D．carry over
监理工程师对认可的工期顺延和经济索赔金如何处理，为什么
