It was found that the reaction to 3,5-dihydroxybenzoic acid, sodium benzoate and catalyst are zero-, one-and one-order respectively. 研究了3,5-二羟基苯甲酸(DHB)为原料采用催化转移加氢法合成3,5-二氧代环己烷羧酸(DOC)的过程,得到了以5%Pd/C为催化剂、甲酸钠为氢供体的3,5-二羟基苯甲酸转移加...
Summary 2922299090. other amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0% 英文别名 hydrocoerulignone tmxdhb 暂无...
∵EF=1/2DE=5,在Rt△EFG中,∵∠EFG=30°,∴EG=1/2EF=5/2cm;(2)如图5中,△AHE与△DHB1中,∵∠FAB1=∠EDF=30°,∴FD=FA,EF=FB=FB1,∴FD-FB1=FA-FE,即AE=DB1,又∵∠AHE=∠DHB1,∴△AHE≌△DHB1(AAS),∴AH=DH. (1)在Rt△EFD中,求出EF的长,根据直角三角形的性质,可得:EG=1/2EF...
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CAS:81069-02-5 产品供应: 产品列表: DHB 2,5-dihydroxybenzoic acid CAS Number: 490-79-9 CHCA α-Cyano-4-hydroxycinnamic acid CAS Number: 28166-41-8 HABA 2-(4'-Hydroxybenzeneazo)benzoic acid CAS Number: 1634-82-8 Sinapinic Acid CAS Number: 530-59-6 THAP 2',4',6'-Trihydroxyacetoph...
(2)连接AD交EF于M,连接OD,设⊙ O的半径为r,先求出FH=DH=4,r=(25)/6,则AB=(25)/3,证明△ FHG和△ DHB全等得FG=BD=5,GH=BH=3,则AG=7/3,再根据AD⊥ BD,EF∥BD及(1)的结论得AE=AG,则GE=2GM,证明△ AGM∽△ ABD得GM=7/5,由此可得EF的长. 反馈 收藏 ...
2,5-二羟基苯甲酸/龙胆酸/5-羟基水杨酸/DHB 490-79-9 司盘85/司班85/山油酸山梨醇酯/失水山梨醇油酸三酯/司本85/山梨糖醇酐三油酸酯/清凉茶醇三油酸酯/Span 85 26266-58-0 环偶氮脒类引发剂V601/偶氮二异丁酸二甲酯/紫外吸收剂V601/AIBME 2589-57-3 ...
∵ DH=CH,∠ DHB=∠ CHG,BH=HG,∴△ DHB≌△ CHG(SAS),∴ CG=BD=5,BH=HG,又∵ BF⊥ AC,CH=√(13),CF=3,由勾股定理可得:HF=√(C(H^2)-C(F^2))=2,FG=√(C(G^2)-C(F^2))=4,∴ BH=HG=HF+FG=4+2=6,则:BF=BH+HF=8;(2)AB=2√2AF=4EF,理由如下:∵∠ BCD=45...
据了解,去年3月,速卖通在全托管的基础上,面向海外消费者推出Choice业务,不仅有低价优势,也在服务上加码——提供3-5日内送达,还有包邮、免运费退货等服务。半托管商品加入“Choice”,也是这一模式具有吸引力的原因之一。 颜光辉能感受到半托管带来的火热。在将六成商品接入半托管后,店铺迎来很多新客户,并且都有着不...
(2)过点D作DG⊥AB于点G,∵∠DHB=∠DGB=∠ABC=90°,∴四边形DHBG为矩形,∴DH=BG=2米,设BC=y米,则DG=BH=(y+6)米,∵∠ACB=45°,∴BC=AB=y(米),∴AG=(y-2)米,∵∠ADG=30°,∴ eq \f(AG,DG) =tan30°= eq \f(\r(3),3) ,∴ eq \f(y-2,y+6) = eq \f(\r(3),3) ,...