微处理器的字长、主频、ALU结构以______是影响其处理速度的重要因素。 ( )

A．是否为104键键盘

B．是否微程序控制

C．是否采用激光打印机

D．有无cache存储器

A client who is planning a pregnancy asks the nurse about ways to promote a healthy pregnancy. Which of the following would be the nurse’s best response（）

A. "Pregnancy is a human process; you don’t have to worry. "
B. "You practice good health habits; just follow them and you’ll be fine. "
C. "There is nothing you can do to have a healthy pregnaney; it’s all up to nature. "
D. "Folic acid, 400 mcg(1mcg= 10μg), improves pregnancy outcomes by preventing certain complications. "