FCC晶体中,常见的弗兰克位错的柏氏矢量为( )
A: [img=48x43]18034e000651811.png[/img]
B: [img=48x43]18034e000e2379f.png[/img]
C: [img=48x43]18034e001715cc5.png[/img]
D: [img=79x43]18034e001fa949e.png[/img]
A: [img=48x43]18034e000651811.png[/img]
B: [img=48x43]18034e000e2379f.png[/img]
C: [img=48x43]18034e001715cc5.png[/img]
D: [img=79x43]18034e001fa949e.png[/img]
举一反三
- 椭圆[img=89x46]180350c3c350fdd.png[/img]所围成的图形绕x轴旋转而成的旋转体的体积为( ) A: [img=48x43]180350c3cc451af.png[/img] B: [img=48x43]180350c3d48e7a3.png[/img] C: [img=46x22]180350c3dcd7ad2.png[/img] D: [img=46x22]180350c3f641788.png[/img]
- 设投掷1颗骰子的点数为X,则( ) 未知类型:{'options': ['E(X)=3.5,D(X)= [img=29x21]17e43c3db9dc21b.png[/img]', ' E(X)=3.5, D(X)= [img=22x41]17e43c3dc2146ee.png[/img]', ' E(X)=3.5,D(X)=3.5', ' E(X)=3.5,D(X)=[img=22x41]17e43c3dcacf7d1.png[/img]'], 'type': 102}
- 设X为随机变量,若数学期望E(X)存在,则数学期望E(E(X))=__________。 A: E(X) B: 0 C: [img=51x27]18038f919d83a08.png[/img] D: [img=63x27]18038f91a6f0476.png[/img]
- 已知[img=122x39]1802e54fe8c1ef7.png[/img],则[img=28x26]1802e54ff153e54.png[/img] A: [img=77x43]1802e54ffa443ae.png[/img] B: [img=108x43]1802e55003381bd.png[/img] C: [img=77x43]1802e5500bf5c55.png[/img] D: [img=48x43]1802e5501522b9b.png[/img] E: [img=77x43]1802e5500bf5c55.png[/img]
- 已知[img=122x39]18030bcda26a7be.png[/img],则[img=33x26]18030bcdaa37c08.png[/img] A: [img=77x43]18030bcdb28994f.png[/img] B: [img=108x43]18030bcdbb1e3a7.png[/img] C: [img=77x43]18030bcdc3aa4df.png[/img] D: [img=48x43]18030bcdcc6a1cd.png[/img] E: [img=77x43]18030bcdc3aa4df.png[/img]