(2014·苏锡常镇四市调研)—How was your interview for going abroad to study?

—Oh，I couldn’t feel any________.I hardly understood most of the questions they asked.

A．worse　

B．harder

C．happier　

D．better

什么是负荷率？提高负荷率主要方法有哪些？什么是配电网的日负荷率，日负荷率与负荷性质的关系如何？