题目内容
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[主观题]
评论下列反应是否可行。 将对二甲氧基苯悬浮在水中,慢慢滴加质量分数为 98% 的硝酸进行一硝化制 2- 硝基 -1,4- 二甲氧基苯时,不断滴加少量尿素,以抑制氧化副反应
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发布时间：2022-01-07
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下列反应式中化合物（1）和（2）分别为
A、苯甲酸、苯甲酸酐
B、邻苯二甲酸、邻苯二甲酸酐
C、邻苯二甲酸、苯甲酸
D、苯甲酸、苯
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第2题
计算下列混合物的凝胶点。各物质的物质的量比为：
(1)邻苯二甲酸酐:甘油=3.0:2.0；
(2)邻苯二甲酸酐:甘油=1.50:0.98；
(3)邻苯二甲酸酐:甘油=4.0:1.0；
(4)邻苯二甲酸酐:甘油:乙二醇=1.50:0.99:0.002。
第4题
Laurence Sterne s fame rests chiefly on his two books, ______and A Sentimental Journey,espLaurence Sterne s fame rests chiefly on his two books, ______and A Sentimental Journey,esp. the former.
第5题
Jim hs ______. He is going to the US to visit his sister.two－months holidyB．two months’ holJim hs ______. He is going to the US to visit his sister.two-months holidy B．two months’ holidys C．two-month holidy D．two months holidy
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A．two-months holiday
B．two months’ holidays
C．two-month holiday
D．two months holiday
第6题
Jim hs _____. He is going to the US to visit his sister.two－months holidyB．two months’ holidJim hs _____. He is going to the US to visit his sister.two-months holidy B．two months’ holidys C．two-month holidy D．two months holidy
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A．two-months holiday
B．two months’ holidays
C．two-month holiday
D．two months holiday
第7题
By spring 1921, his exploding global fame led to a grand two-month visit to the United States, where he received so warm a welcome that he would evoke mass frenzy wherever he went. ()
第8题
the hexadecimal number system has 16 characters , six of which are alphabetic characters()
第9题
在空格中填写正确的数据module decoder_using_case （） 4’h0 : decoder_out = 16’h0001; 4’h1 : decoder_out = 16’h0002; 4’h2 : decoder_out = 16’h0004; 4’h3 : decoder_out = 16’h0008; 4’h4 : decoder_out = 16’h0010; 4’h5 : decoder_out = 16’h0020; 4’h6 : decoder_out = 16’h0040; 4’h7 : decoder_out = 16’h0080; 4’h8 : decoder_out = 16’h ; 4’h9 : decoder_out = 16’h0200; 4’hA : decoder_out = 16’h0400; 4’hB : decoder_out = 16’h0800; 4’hC : decoder_out = 16’h1000; 4’hD : decoder_out = 16’h2000; 4’hE : decoder_out = 16’h4000; 4’hF : decoder_out = 16’h8000; endcase end endendmodule
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