Which of the following statements is true regarding simple sort techniques

A．exchange sort if frequently referred to as a bubble sor

B．exchange sort is the least expensiv

C．if random data are in an array that is to be sorted ,an insertion sort will give then best performance for large elements with small sort item

D．both insertion sort an selection sort require O( move

在多级直流放大器中，对零点飘移影响最大的是（）。

A、前级

B、后级

C、中间级

D、前后级一样