涓€绱�(j铆)娉ㄥ唺(c猫)绲�(ji茅)妲�(g貌u)宸ョ▼甯€冭│鍩虹(ch菙)鐭ヨ瓨(sh铆)缈�(x铆)椤屽叓
鏇存柊鏅�(sh铆)闁擄細2009-10-19 15:27:29
渚嗘簮锛殀0
鐎忚
鏀惰棌
鐎忚鏀惰棌
绲�(ji茅)妲�(g貌u)宸ョ▼甯牨(b脿o)鍚�銆佽€冭│銆佹煡鍒嗘檪(sh铆)闁� 鍏嶈不(f猫i)鐭俊鎻愰啋
1銆佷笅鍦栫ず涓€鍓涙€х郴鏁�(sh霉)鐐簁鐨勫綀绨т笅鎺涗竴璩�(zh矛)閲忕偤m鐨勭墿濉�锛岀暥(d膩ng)鐗╁铏曚簬骞宠 鏅�(sh铆)褰堢哀鐨勯潨浼搁暦鐐何�锛屽墖鐣�(d膩ng)鐗╁寰為潨骞宠 浣嶇疆涓嬮檷璺濋洟h鏅�(sh铆)锛屽綀鎬у姏鎵€浣滅殑鍔焪鐐猴細
(A) w=0.5k锛伙紙h锛嬑达級2锛嵨�2锛�锛�
(B) w=0.5k锛晃�2锛嶏紙h锛嬑达級2锛斤紱
(B) w=0.5k锛晃�2锛嶏紙h锛嬑达級2锛斤紱
(C) w=0.5k锛坔锛嬑达級2锛�
(D) w=0.5kh2銆�
绛旀锛氾紙B锛�
瑙ｆ瀽锛氭摎(j霉)褰堟€у姏鍋氬姛鐨勫叕寮�锛屾槗寰梬=0.5k锛晃�2锛嶏紙h锛嬑达級2锛�
2銆侀噸P鐨勫皬鐗╁锛岃嚜涓嬪湒鎵€绀篈榛�(di菐n)鍦ㄩ墰鐩撮潰鍏�(n猫i)娌垮崐寰戠偤r鐨勫崐鍦揂CB婊戜笅锛屽叾鍒濋€熺偤闆讹紝涓嶈▓(j矛)鎽╂摝锛屽墖鐗╁鍦ㄥ湒绀轰綅缃墍鍙楃殑鍙嶅姏N鐨勫ぇ灏�(浠ョ墿濉婂拰鍦撳績O鐨勯€ｇ窔鑸囨按骞崇窔OA鐨勫ぞ瑙捪嗚〃绀�)鐐猴細
(A) N=4Psin蠁锛�
(B) N=3Psin蠁锛�
(C) N=2Psin蠁锛�
(D) N=Psin蠁o銆�
绛旀锛氾紙B锛�
瑙ｆ瀽锛氭牴鎿�(j霉)姗�(j墨)姊拌兘瀹堟亽瀹氬緥鍙煡锛岀墿濉婄殑鍚戝績鍔犻€熷害鐐�2gsin蠁锛屽啀鏍规摎(j霉)閬�(d谩)鏈椾集鍘熺悊锛屽垪寰戝悜鐨勫钩琛℃柟绋嬪緱 N=3Psin蠁
3銆佹苯杌婇噸W锛屼互鍕诲姞閫熷害a娌挎按骞崇洿绶氶亾璺悜鍙抽亱(y霉n)鍕�(d貌ng)锛屽叾閲嶅績C闆㈠湴闈㈢殑楂樺害鐐篽锛屾苯杌婄殑鍓�銆佸悗杌稿埌閫氶亷鍏堕噸蹇僀鐨勫瀭绶氱殑璺濋洟鍒嗗垾鐐篖1鍜孡2锛屽涓嬪湒鎵€绀�銆傚湴闈㈠皪(du矛)姹借粖鍓嶈吉鐨勬澹撳姏N1鑸囧皪(du矛)鍚庤吉鐨勬澹撳姏N2鐨勫ぇ灏忓垎鍒ョ偤锛�
绛旀锛氾紙C锛�
瑙ｆ瀽锛氭牴鎿�(j霉)閬�(d谩)鏈椾集鍘熺悊锛屾妸鎱ｆ€у姏Wa/g鍔犲叆绯荤当(t菕ng)锛岀敱浜庤吉鑳庤檿鍙湁澹撳姏鑸囨懇鎿﹀姏锛屾晠鍒嗗垾灏�(du矛)鍓嶅悗杓殑鎺ュ湴榛�(di菐n)鍒楄檿鍔涚煩骞宠 鏂圭▼锛屽彲寰楀墠杓殑姝ｅ鍔汵1鑸囧皪(du矛)鍚庤吉鐨勬澹撳姏N2鐨勫ぇ灏忓垎鍒ョ偤
4銆佸湪鐢ㄨ櫅浣嶇Щ鍘熺悊姹備笅鍦栨墍绀洪潨瀹氬璺ㄦ鏀骇B鐨勫弽鍔涙檪(sh铆)锛屽皣鏀骇B瑙ｉ櫎锛屼唬浠ュ弽鍔汻B锛屾鏅�(sh铆)B銆丒鍏╅粸(di菐n)铏涗綅绉诲ぇ灏徫磖B鑸囄磖E鐨勯棞(gu膩n)绯荤偤锛�
(A) 未rB=未rE/2锛�
(B) 未rB=2未rE/3锛�
(C) 未rB=未rE锛�
(D) 未rB=3未rE/2銆�
绛旀锛氾紙B锛�
瑙ｆ瀽锛氱敱楂旂郴鐨勫咕浣曢棞(gu膩n)绯�锛孋銆丒鍏╅粸(di菐n)铏涗綅绉诲ぇ灏忕浉绛�锛屾柟鍚戠浉鍙嶏紝B榛�(di菐n)铏涗綅绉荤偤C榛�(di菐n)铏涗綅绉荤殑2/3锛屾晠B銆丒鍏╅粸(di菐n)铏涗綅绉诲ぇ灏徫磖B鑸囄磖E鐨勯棞(gu膩n)绯荤偤未rB=2未rE/3
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