______ the poem a second time, the meaning will become clearer to you.

A．You having read

B．While reading

C．When you read

D．If reading

关于表面活性剂的术语请选择

表面活性剂的溶解度急剧增大时的温度（）

A．Krafft点

B．昙点

C．HLB

D．CMC

E．杀菌与消毒