[单选题]视频监控系统一般由摄像子系统、( )、控制子系统和显示记录四个主要部分组成。
A.显示器
B.图像传输子系统
C.气象检测系统
D.录像子系统

Efforts to educate people about the risks of subs lance abuse seem to deter some people from using -dangerous substances, if such efforts are realistic about what is genuinely dangerous and what is not. Observed declines in the use of such drugs as LSD, PCP, and Quaaludes since the early 1970’s are probably related to increased awareness of the risks of their use, and some of this- awareness was the result of warnings about these drugs in "underground" papers read by drug users. Such sources are influential, because they do not give a simple "all drugs are terrible for you" message. Drug users know there are big variations in danger among drugs and antidrug education that ignores or denies this is likely to be ridiculed. This is illustrated by the popularity among young marijuana users of Reefer Madness, a widely unrealistic propaganda film against marijuana made in the 1930s. This film made the rounds of college campuses in the 1970s and joined rock-mus
A. effectively deterred marijuana use
B. was rejected by young marijuana use
C. did not picture the danger of marijuana realistically
D. was welcomed by marijuana users because it told them how to gel high

患者，男，47岁。主诉：下唇有白色斑块3个月余。现病史：3个月前患者发现下唇右侧有白色斑块，擦不掉，无疼痛，无明显隆起，未发生过溃疡。既往史：有大量吸烟史，全身其他系统无异常。口腔检查：下唇右侧唇红中外1/3处有1个2mm直径的白色斑块，无法擦去，无触痛，不隆起，基底软，无硬结，周边不红。口内其他检查无异常。请从诊断、诊断依据及治疗三个方面展开论述。