2-溴丁烷与NaOH的醇溶液一起加热,发生反应的主要产物是
A: [img=176x43]18034258749b054.png[/img]
B: [img=154x42]180342587c6563b.png[/img]
C: [img=145x62]1803425884c2f4b.png[/img]
D: [img=171x46]180342588cee086.png[/img]
A: [img=176x43]18034258749b054.png[/img]
B: [img=154x42]180342587c6563b.png[/img]
C: [img=145x62]1803425884c2f4b.png[/img]
D: [img=171x46]180342588cee086.png[/img]
举一反三
- 2-溴丁烷与NaOH的醇溶液一起加热,发生反应的主要产物是[img=145x62]1803424ebe0c788.png[/img]
- 1.设随机变量X的密度为[img=186x61]18034ea953ec9dd.png[/img]则常数A=________,概率[img=146x25]18034ea95d30d08.png[/img]__________. A: A=2,P(X>1|X<2)=[img=39x24]18034ea9659b618.png[/img] B: A=-2,P(X>1|X<2)=[img=39x24]18034ea9659b618.png[/img] C: A=2,P(X>1|X<2)=[img=47x44]18034ea9768a8c2.png[/img] D: A=-2,P(X>1|X<2)=[img=47x44]18034ea9768a8c2.png[/img]
- 已知随机变量X的分布函数为[img=136x49]1803b69024c8270.png[/img] ,则X的均值和方差分别为 A: E(X)=2, D(X)=4 B: E(X)=4, D(x)=2 C: [img=162x43]1803b6902cd8bfb.png[/img] D: [img=162x43]1803b69034d9ffd.png[/img]
- 随机变量X服从正态分布N(2, 4),其概率密度f(x) = ( ). A: [img=191x60]1802f2ad96fdbf7.png[/img] B: [img=220x63]1802f2ada0bf186.png[/img] C: [img=221x63]1802f2adabac400.png[/img] D: [img=212x57]1802f2adb8ce515.png[/img]
- 随机变量X服从正态分布N(2, 4),其概率密度f(x) = ( ). A: [img=191x60]1802f2aae5be86e.png[/img] B: [img=220x63]1802f2aaefb9a64.png[/img] C: [img=221x63]1802f2aafa6bb41.png[/img] D: [img=212x57]1802f2ab04ebe63.png[/img]