A．rememberB．countC．raiseD．differentiate

According to the second paragraph, why does the differentiated marketing provide a better

It is very difficult for a child to adhere to rules.A．rememberB．followC．understandD．learn

A．estimatedB．countC．calculateD．estimate

It is very difficult for a child to adhere to rules.A．rememberB．followC．understandD．learn

An increased differential between the inlet and outlet of a strainer usually indicates the

【C10】A．estimateB．countC．decideD．measure