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alt="開(kāi)學(xué)季活動(dòng)" class="banner"></a>   <div id="gwr18lkl3dc" class="news_mian"> <h1><span id="ycTitle"></span>關(guān)于工作M的說(shuō)法，正確的是（?。?/h1> <div id="gwr18lkl3dc" class="mark"> <div id="gwr18lkl3dc" class="lTxt"> <span id="gwr18lkl3dc" class="time">2019-02-25 20:10</span> <span id="gwr18lkl3dc" class="source">來(lái)源：<a href="http://m.zcjx68.com" title="建設工程教育網(wǎng)">建設工程教育網(wǎng)</a></span> </div> <a href="javascript:void(0);" target="_self" class="collection li-an"></a> <a href="javascript:void(0);" target="_self" class="print" onclick="javascript:window.print()">打印</a> <div id="gwr18lkl3dc" class="font_size">字體：<a href="javascript:void(0);" target="_self" class="big">大</a><a href="javascript:void(0);" target="_self" class="small">小</a></div> </div> </div>   <div id="gwr18lkl3dc" class="news_con"> <div id="gwr18lkl3dc" class="jxbox clearfix"> <p style="TEXT-INDENT: 2em">在二級建造師考試備考中有很多的考生對考點(diǎn)、知識點(diǎn)苦惱不堪。其實(shí)沒(méi)有必要這樣，我們只要對這些知識點(diǎn)多加注意，而且對考點(diǎn)、知識點(diǎn)做好篩選和提煉，有的放矢地去學(xué)習，備考效率就會(huì )有所提高。</p> <p style="TEXT-INDENT: 2em">2019年二級建造師為大家準備了一些二建例題、試題等，大家快來(lái)學(xué)習吧!</p> <p>　　某雙代號網(wǎng)絡(luò )計劃中，假設計劃工期等于計算工期，且工作M的開(kāi)始節點(diǎn)和完成節點(diǎn)均為關(guān)鍵節點(diǎn)。關(guān)于工作M的說(shuō)法，正確的是(　)。</p> <p>　　A.工作M是關(guān)鍵工作</p> <p>　　B.工作M的自由時(shí)差為零</p> <p>　　C.工作M的總時(shí)差等于自由時(shí)差</p> <p>　　D.工作M的總時(shí)差大于自由時(shí)差</p> <p>　　『正確答案』C</p> <p>　　『答案解析』本題考查的是雙代號網(wǎng)絡(luò )計劃時(shí)間參數的計算。因為工作M的完成節點(diǎn)為關(guān)鍵節點(diǎn)，則該工作的緊后工作中必有一項是關(guān)鍵工作。如果該工作的完成節點(diǎn)是終點(diǎn)節點(diǎn)，那么其總時(shí)差就等于該工作的自由時(shí)差，就是時(shí)標網(wǎng)絡(luò )圖中波形線(xiàn)的長(cháng)度。如果該工作的完成節點(diǎn)非終點(diǎn)節點(diǎn)，那么該工作的總時(shí)差等于其緊后工作的總時(shí)差與該工作自由時(shí)差的最小值。該工作緊后工作總時(shí)差的最小值是0，所以該工作的總時(shí)差等于自由時(shí)差。所以答案選C。參見(jiàn)教材P132～134。</p> <p>　　【總結】當計劃工期等于計算工期時(shí)，只要完成節點(diǎn)是關(guān)鍵節點(diǎn)，那么這項工作的自由時(shí)差和總時(shí)差是相等的，且不一定為零。</p> 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