A: [img=35x27]180397a4ba679dd.png[/img]
B: [img=17x22]180397a4c2f2839.png[/img]
C: [img=35x27]180397a4cbf2ddb.png[/img]
D: [img=35x27]180397a4d50a688.png[/img]
举一反三
- 某晶体具有金刚石结构,晶格常数为a,其原胞的体积为: A: [img=35x27]180397a4b824759.png[/img] B: [img=35x27]180397a4c04aaf0.png[/img] C: [img=35x27]180397a4c8785b6.png[/img] D: [img=17x22]180397a4d0bf505.png[/img]
- 某晶体具有NaCl结构,晶格常数为a,其原胞的体积为: A: [img=35x27]180397a4d982b52.png[/img] B: [img=35x27]180397a4e19af0e.png[/img] C: [img=17x22]180397a4e973344.png[/img] D: [img=35x27]180397a4f18736a.png[/img]
- 某晶体具有体心立方的结构,晶格常数为a,其原胞的体积为: A: [img=35x27]180397a4983141c.png[/img] B: [img=35x27]180397a4a1198d1.png[/img] C: [img=17x22]180397a4a976b9a.png[/img] D: [img=35x27]180397a4b1d9a2a.png[/img]
- 金刚石结构Si晶体的晶格常数为a,其原胞的体积为 A: [img=17x22]1803ddf51f8acd4.png[/img] B: [img=35x27]1803ddf528a78ed.png[/img] C: [img=35x27]1803ddf531759a0.png[/img] D: [img=35x27]1803ddf5392fdde.png[/img]
- 考虑一种面心立方单晶材料,其晶格常数为a,则该晶体的原子体浓度为() A: [img=35x27]18034f8a7c6dabe.png[/img] B: [img=35x27]18034f8a84c3775.png[/img] C: [img=35x27]18034f8a8d24c0d.png[/img] D: [img=35x27]18034f8a95b407f.png[/img]
内容
- 0
Cu结构原胞中包含几个原子?设晶格常数为a,Cu的W-S原胞体积为 。 未知类型:{'options': ['1,[img=17x22]1803922f5fb778a.png[/img]/4', '2,[img=17x22]1803922f5fb778a.png[/img]/4', '2,[img=17x22]1803922f5fb778a.png[/img]/2', '1,[img=17x22]1803922f5fb778a.png[/img]'], 'type': 102}
- 1
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]
- 2
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]
- 3
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]
- 4
随机变量X服从正态分布N(2, 4),其概率密度f(x) = ( ). A: [img=191x60]1802f2c48daf2cd.png[/img] B: [img=220x63]1802f2c497e7d97.png[/img] C: [img=221x63]1802f2c4a2253a6.png[/img] D: [img=212x57]1802f2c4acda7d1.png[/img]