局部剖视-选择正确的主视图http://image.zhihuishu.com/testzhs/onlineexam/ueditor/201512/159f6d8a0a814f96ad5f0e028fa7f158.png
举一反三
- 正确的局部剖视的俯视图是（ ）。http://image.zhihuishu.com/testzhs/onlineexam/ueditor/201704/92590bf0d14d4b84b33452c42154dd1a.png
- 已知f(t)↔F(w)，则下列说法正确的是（） A: tf(t)↔wF(w) B: F(t)↔f(w) C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/e987a05c70d3455bad2fbdef6ce1fc1d.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/92f68075a5ff43708660199e4eed9415.png" />
- 已知f1(t)和f2(t)波形如下，若f(t)=f1(t)*f2(t)，则f(0)=http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/e38151c6fa664a008f547dd1af821f92.bmp
- 如图所示，在边长为a的正六面体的棱边CD上，作用着与其重合的力F，则力F对x、y、z轴的矩为[img=351x334]17de8f8200fff66.png[/img] A: Mx(F)= -Fa， My(F)=Fa， Mz(F)=0 B: Mx(F)=0 My(F)=0 Mz(F)=Fa C: Mx(F)=Fa My(F)= -Fa Mz(F)=0 D: Mx(F)=0 My(F)=0 Mz(F)=0
- 用牛顿迭代法解方程f(x)=0，选初始值x0满足( )，则它的解序列收敛到方程f(x)=0的根。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201903/aeb6aa356de84f49ad3697df7563111a.jpg