功率放大器有哪几种类型?各有何特点?

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问题:

功率放大器有哪几种类型?各有何特点?

考点:火电电力职业技能鉴定考试水电自动装置检修工(高级)水电自动装置检修工(高级)题库
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原发性开角型青光眼治疗原则()

A.一旦确诊立即手术

B.可用1%匹罗卡品、乙酰唑胺等药物

C.可行氩激光小梁成型术

D.当视野、眼底有进行性改变时可行小梁切除术

E.早期定期观察

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材料一:联合国环境署确定的2007年世界环境日主题为“冰川消融,后果堪忧”。我国环保总局将2007年世界环境日中国主题确定为“污染减排与环境友好型社会”。

材料二:2007年8月29日, 国务院国有资产监督管理委员会副主任黄淑和说,中央企业节能减排工作目标已经确定:到“十一五”期末,中央企业要确保完成单位增加值能耗降低20%,主要污染物排放总量减少    10%,其中石油石化、冶金、电力、交通运输、化工、煤炭、建材等重点行业,要力争到2009年末,提前完成上述目标。

请根据以上材料解答下列各题。

(1)材料体现了我国的什么战略?

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(2)结合所学知识谈谈为什么我国要加强节能减排工作?

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(3)怎样才能把我国建设成为资源节约型、环境友好型社会?

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"Culture shock" occurs as a result of total immersion in new culture. It (51) to "people who have been suddenly transplanted abroad. " Newcomers may be anxious (52) they do not speak the language, know the (53) , or understand people’s behavior in daily life. The visitor finds that "yes" may not always mean "yes", that friendliness does not (54) mean friendship or that statements that appear to be serious are really intended (55) jokes. The foreigner may be unsure as to when to shake hands or embrace, when to (56) conversations, or how to approach a stranger. The (57) of "culture shock" helps explain feelings of bewilderment and disorientation. Language problems do not account for all the frustrations that people feel. When one is (58) of everything that was once familiar, such as understanding a transportation system, knowing how to register for university classes, (59) knowing how to make friends, difficulties in coping with the new society may (60) .

A.denied

B.refused

C.lost

D.deprived

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以下哪几种情况会被执行两次罚球一次掷边线球()

A.技术犯规

B.违反体育道德犯规

C.打手犯规

D.阻挡犯规

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根据什么原则选择粗基准和精基准?

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