如图所示是某种型号的正六角螺母毛胚的三视图,则他的表面积为? (2007?济南)如图所示是某种型号的正六角螺母毛坯的三视图...
\u5982\u56fe\u6240\u793a\u662f\u67d0\u79cd\u578b\u53f7\u7684\u6b63\u516d\u89d2\u87ba\u6bcd\u6bdb\u576f\u7684\u4e09\u89c6\u56fe\uff0c\u6c42\u5b83\u7684\u8868\u9762\u79ef\u4fa7\u9762\u79ef=6\u00d73\u00d72=36\uff08cm2\uff09\uff0c\u5e95\u9762\u4e3a\u8fb9\u957f\u4e3a2cm\u7684\u6b63\u516d\u8fb9\u5f62\uff0c\u5b83\u53ef\u5206\u62106\u4e2a\u8fb9\u957f\u4e3a2cm\u76846\u4e2a\u7b49\u8fb9\u4e09\u89d2\u5f62\uff0c\u6240\u4ee5\u4e00\u4e2a\u5e95\u9762\u79ef\u662f\uff1a6\u00d734\u00d722=63\uff08cm2\uff09\uff0c\u8868\u9762\u79ef=\uff0863\uff09\u00d72+36=\uff08123+36\uff09cm2\uff0e
\u4fa7\u9762\u79ef=6\u00d73\u00d72=36\uff08cm2\uff09\uff0c\u5e95\u9762\u53ef\u4ee5\u770b\u505a2\u4e2a\u7b49\u8170\u68af\u5f62\u7ec4\u6210\uff0c\u5b83\u4eec\u7684\u9ad8\u662f\uff1a22-12=3\uff08cm\uff09\uff0c\u6240\u4ee5\u4e24\u4e2a\u5e95\u9762\u79ef\u662f\uff1a2\u00d72\u00d73(2+4)2=123\uff08cm2\uff09\uff0c\u8868\u9762\u79ef=\uff08123+36\uff09cm2\uff0e
36+12(根号3)六个侧面2*3*6=36,两个底面6根号3*2=12(根号3)
绛旓細550 x 20/(20+5)=440(姣崌)
绛旓細H0: a=1600 H1: a涓嶇瓑浜1600 妫楠岀粺璁¢噺鐨勫间负 锛1626-1600锛/( 58/4)=1.7931 < 2.13 鎵浠ワ紝涓嶅湪鍙岃竟妫楠岀殑鎷掔粷鍩熴傚洜姝わ紝鍐崇瓥鏄細涓嶆嫆缁滺0銆傚嵆璁や负鍦ㄧ幇鏈夌殑鏍锋湰鏉′欢涓嬫棤娉曟嫆缁滺0锛屽彲浠ヨ涓篴=1600銆傛敞锛氬鏋滆冭瘯锛岃繖鏍峰氨琛屼簡銆傚疄闄呴棶棰樹腑锛岃杩涗竴姝ュ姞澶ф牱鏈閲忋傝浣忥細浣滃亣璁炬楠岃鐨勬槸...
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绛旓細鍙鏌愮鍨嬪彿瀵煎脊10鏋氳繘琛屽皠绋嬭瘯楠,鍋囪灏勭▼鎬讳綋x鏈嶄粠姝f佸垎甯僴(渭,蟽2),鍏朵腑鍙傛暟渭,蟽2鏈煡 鐜版祴寰10涓暟鎹涓:56544958454750515250鍗曚綅鍏噷璇曟眰鏈煡鍙傛暟渭鍙娤2鐨勭疆淇″害涓0.95鐨勭疆淇″尯闂... 鐜版祴寰10涓暟鎹涓:56 54 49 58 45 47 50 51 52 50鍗曚綅鍏噷璇曟眰鏈煡鍙傛暟渭鍙娤2鐨勭疆淇″害涓0.95鐨勭疆淇″尯闂 ...
绛旓細锛1锛夌數鍔ㄨ溅鑷杞︾殑鐢垫睜涓鸿搫鐢垫睜锛屽洜姝ょ數鍔ㄨ嚜琛岃溅鍏呯數杩囩▼鎶婄數鑳借浆鍖栦负鍖栧鑳斤紱鐢靛姩鑷杞﹁椹舵斁鐢佃繃绋嬫妸鍖栧鑳借浆鍖栦负鐢佃兘锛屽啀杞寲涓虹數鍔ㄨ嚜琛岃溅鐨勬満姊拌兘锛涳紙2锛夆憼鐢靛姩杞︾殑鐗靛紩鍔汧=f=0.02G=0.02脳锛700N+300N锛=20N锛涒憽鈭礟=UI鈭寸數鍔ㄨ嚜琛岃溅浠ラ瀹氬姛鐜囪椹舵椂鐨勫伐浣滅數娴侊細I=P棰漊棰=200W36V鈮5.56A...
绛旓細鑰屼粠鏌愮绋嬪害涓婅,鏁版帶鏈哄簥鐨勫嚭鐜版鏄緢澶х殑婊¤冻浜嗚繖涓瑕佹眰銆 1952骞,缇庡浗楹荤渷鐞嗗伐瀛﹂櫌鎴愬姛鐨勭爺鍒跺嚭涓濂椾笁鍧愭爣鑱斿姩,鍒╃敤鑴夊姩涔樻硶鍣ㄥ師鐞嗙殑瀹為獙鎬ф暟鎺х郴缁,骞舵妸瀹冭鍦ㄤ竴鍙扮珛寮忛摚搴婁笂銆傚綋鏃剁敤鐨勭數瀛愬厓浠舵槸鐢靛瓙绠,杩欏氨鏄笘鐣屼笂鐨勭涓鍙版暟鎺ф満搴娿1959骞,鏁版帶瑁呯疆涓箍娉涢噰鐢ㄧ數瀛愮鍜屽嵃鍒风數璺澘,浠庤岃法鍏ユ暟鎺х殑绗簩浠c
绛旓細鈶犫埖S=a2鈭存鏂瑰舰鐨勮竟闀夸负a=S=0.01m2=0.1m=10cm锛涒憽鈭1m/s=3.6km/h锛屸埓700m/s=700脳3.6km/h=2520km/h锛庢晠绛旀涓猴細10锛2520锛
绛旓細璁鏌鎵圭數瀛愬厓浠剁殑瀵垮懡X鏈嶄粠姝f佸垎甯僋锛埼硷紝蟽2锛夎嫢渭=160锛岃姹侾{120<X<200}=0.8锛屽厑璁赶冩渶澶т负 X~N(160,蟽2)(X-160)/蟽~N(0,1)P(120<X<200)=P(-40<X-160<40)=P(-40/蟽<(X-160)/蟽<40/蟽)=2桅(40/蟽)-1=0.8鏌ヨ〃鍚=31.25 ...
绛旓細1000鍙颁腑20鍙版槸娆″搧 閭d箞娆″搧鐜囨槸20/1000=2 姝e搧鐜=1-2%=98 閿鍞簡400鍙帮紝鎸夋鐜囧叾涓湁2%鐨勬鍝侊紝98%鐨勬鍝 鎵浠ュ墿浣欑殑涔熸槸2%娆″搧锛98%姝e搧 姝e搧鐜=98
绛旓細鈭靛崱杞﹁疆鑳庣殑浣跨敤瀵垮懡鏈嶄粠姝f佸垎甯僋锝烇紙36203锛48272锛夛紝鈭碢锛36203-2脳4827锝36203+2脳4827锛=0.9544鈭垫苯杞﹀叕鍙镐竴娆′粠璇ュ巶涔颁簡500涓疆鑳庘埓浣跨敤瀵垮懡鍦36203-2脳4827锝36203+2脳4827鑼冨洿鍐呯殑杞儙涓暟鏄500脳0.9544=477鏁呯瓟妗堜负锛477