举一反三
- As shown in the figure, which of the following is true? [img=399x398]1803a03c60cf5d2.png[/img][img=365x385]1803a03c6c3b38b.png[/img] A: FRC = F’RC = 0 B: FRC = 0, F’RC ≠ 0 C: FRC ≠ 0, F’RC ≠ 0 D: FRC ≠ 0, F’RC = 0
- People listen to music on the following three planes: (1)the _____________ plane, (2) the ___________plane, (3) the___________ _____________ plane.
- If a body of revolution is obtained when the plane figure, enclosed by [img=99x25]1803e249c891742.png[/img], [img=93x23]1803e249d0cf2dc.png[/img] and [img=11x14]1803e249d81ae7c.png[/img] axis, rotates around the [img=11x14]1803e249d81ae7c.png[/img] axis for one cycle, then its volume is [img=141x52]1803e249eb19a2f.png[/img].
- In Figure (a), +t indicates the increase of the temperature and -t indicates the decrease of the temperature. The shape of bending moment diagram of is as shown in Figure (b).[img=603x369]1803b80c6f7f661.png[/img]
- We have many ________ in the following picture.[img=991x733]18035d44eb1382d.png[/img] A: points B: lines C: triangles D: hearts
内容
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We have many ________ in the following picture.[img=650x488]1802e30c9f275bc.jpg[/img] A: points B: lines C: triangles D: hearts
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In the plane problem, the sliding surface is mainly simplified into ____ A: Circular arc B: Rectilinear figure C: Compound D: Dustpan shape
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Suppose [img=86x25]1803dc1d9a21d4a.png[/img]. About [img=15x19]1803dc1da297a70.png[/img] which one of the following is true? A: [img=167x46]1803dc1daaf1136.png[/img] B: [img=106x44]1803dc1db71abb0.png[/img] C: [img=134x46]1803dc1dbf51d64.png[/img] D: [img=202x48]1803dc1dca32ae4.png[/img]
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According to the circuits shown in figure 3 and the figure 4, the current in Figure 5 i = [img=853x121]180317233475736.jpg[/img] Figure 3 Figure 4 Figure 5 A: -6A B: -4 A C: -2 A D: 6A
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CF(H,E)在[-1,1]上取值，CF(H,E)[img=11x13]17e435cd2137a1f.jpg[/img]0表示（ ）；CF(H,E)[img=11x13]17e43aa2c02c2f8.jpg[/img]0表示（ ）；CF(H,E)=0表示（ ）；CF(H,E)=-1表示（ ）；CF(H,E)=1表示（ ）。