A、<span style="FONT-SIZE: 12pt; LINE-HEIGHT: 150%; FONT-FAMILY: 宋体">连续强化<span lang="EN-US"><span style="mso-spacerun: yes"> </span></span></span>
B、<font face="宋体">间隙强化<span lang="EN-US"><span style="mso-spacerun: yes"></span></span></font>
C、<font face="宋体">正强化<span lang="EN-US"><span style="mso-spacerun: yes"> </span></span></font>
D、<font face="宋体">负强化</font>