The main function of a processor is to (68) and carry out instructions which usually consist of operation and (69) . The term to measure the speed of the processor is called a Megahertz (MHz), which means million (70) per second.

A．bits

B．bytes

C．cycles

D．words

量纲和谐原理是指下述哪一条？（）

A.不同性质的物理量不能作加、减运算

B.不同性质的物理量可作乘、除运算

C.物理方程式中，各项量纲必须一致

D.以上答案均不对