【简答题】G是黄酮类药物的主要合成中间体,可由A( -CH=CH 2 )和D(HO- -CHO)按如下方法合成: 已知以下信息: ①C不能发生银镜反应. ② -ONa+RCH 2 I→ -OCH 2 R ③RCOCH 3 +R'CHO 一定条件 RCOCH=CHR' 回答下列问题: (1)A的化学名称为______,1molA最多可跟______molH 2 发生反应. (2)D的含氧官能团的名称是____...
【简答题】田间检验报告应包括基本情况、[填空(1)]和检验意见。
【单选题】赵某,女,43岁,拟明日全身麻醉下行乳腺癌根治术,为防止术后呕吐窒息,麻醉前至少禁饮:
【单选题】毛泽东关于三个世界划分的战略,处于第一世界的国家有 ( )
【单选题】What does the passage say about BBC's forecasters?
A.
They read from a script.
B.
They are professionals.
C.
They use a map for presentation.
D.
They care about their clothes.
【简答题】田间检验报告应包括基本情况、检验结果和( )
【单选题】The translation has first to read the script. thoroughly to get an overall ______ of the film.
【简答题】Read out your presentation from a script. ___________