A:①②
B:③④
C:①③
D:②④
Flags have existed for over 3,000 years. The earliest flags were wooden or metal poles with a carving. About 2,000 years ago pieces of fabric were added to some poles for decoration. Over the next 500 years the free-flying part of the flag became more important.
指标物种
马尾松
苦槠
石栎
青冈
光补偿点(千勒克司)
7
3
1.5
1
光饱和点(千勒克司)
11
6
3.3
2.5
(光补偿点:光合速率等于呼吸速率时的光强.光饱和点:达到最大光合速率所需的最小光强)
阅读下文,回答相关问题。 熊鼎,字伯颍,临川人。元末举于乡,长①龙溪书院。江西寇乱,鼎结乡兵自守。陈友谅屡胁之,不应。邓愈镇江西,数延见,奇其才,荐之。太祖欲官之,以亲老辞,乃留愈幕府赞②军事。母丧除,召至京师,授德清县丞。松江民钱鹤皋反,邻郡大惊,鼎镇之以静。迁起居注③,承诏搜括故事可惩戒者,书新宫壁间。舍人耿忠使广信④还,奏郡县官违法状,帝遣御史廉⑤之。而时已颁赦书,丞相李善长再谏不纳,鼎偕给事中尹正进曰:“朝廷布大信于四方,复以细故烦御史,失信,且亵威。”帝默然久之,乃不遣御史。 【注释】①长:执掌。②赞:帮助,辅佐。③起居注:官职名。④广信:地名。⑤廉:察考。