对一路信号进行FSK调制时，若载波频率为fc，调制后的信号频率分别为f1和f2 (f1＜f2)，则三者的关系是 (1) 。当对多路信号进行调制时，调制后各信号的频谱 (2) 。信号到达接收端后通过 (3) 分离各路信号。WDM与FDM工作方式相似，但WDM调制的是 (4) 。ILD是 (5) 使用的设备。
2（）| Many theories concerning the causes of
juvenile delinquency (crimes committed by young people) focus either on the
individual or on society as the major contributing influence. Theories
{{U}} (31) {{/U}} on the individual suggest that children engage in
criminal behavior {{U}} (32) {{/U}} they were not sufficiently penalized
for previous misdeeds or that they have learned criminal behavior through
{{U}} (33) {{/U}} with others. Theories focusing on the role of society
suggest that children commit crimes in {{U}} (34) {{/U}} to their failure
to rise above their socioeconomic status, {{U}} (35) {{/U}}as a rejection
of middle-class values. Most theories of juvenile delinquency have focused on children from disadvantaged families, {{U}} (36) {{/U}} the fact that children from wealthy homes also commit crimes. The latter may commit crimes A. immune B. resistant C. sensitive D. subject [单选题]终到前,双班乘务的提前<___>双班作业,全面清扫擦拭,达到不带垃圾、污水、粪便。( )
A.20min B.30min C.40min D.60min [简答题]路由策略过滤工具有哪几种？
[单项选择]防撞桶宜布设在（）或上游过渡区与缓冲区之间。
A. 警告区 B. 缓冲区 C. 工作区 D. 上游过渡区 [多项选择]彩色铅笔表现的基本技法是（）。
A. 排线法 B. 叠彩法 C. 渲染法 D. 退晕法 E. 线描法 [多选题]动车组试运行分为（ ）。
A.新造试运行 B.高级修试运行 C.临修试运行 D.一级修试运行 [简答题]餐饮业有哪些发展趋势？
[填空题]
A--An E-mail Account B--Web Site Design [多选题]吊运易燃易爆的气瓶时，要做到()。
A.旋紧瓶帽 B.竖直堆放 C.防止撞击气瓶阀门 D.妥善固定·防止滚动 [单选题]根据《职业病防治法》,劳动者离开用人单位时, 索要本人职业健康监护档案的,用人单位( )提供。
A.有偿 B.无偿 C.不得 我来回答: 提交
|
