4）磁共振成像系统不包括( )
A: static magnetic field
B: RF pulse system
C: gradient magnetic field
D: filtration
A: static magnetic field
B: RF pulse system
C: gradient magnetic field
D: filtration
举一反三
- The type of field generated by a DC tacho-generator is A: pulsating magnetic field B: static field C: rotating field D: do not need field
- The curl equation [img=154x44]1803a2a153c85f5.png[/img]shows that : A: The time-varying magnetic field can generate an electric field, in which the elecric field lines is closed around the magnetic field line. B: The time-varying magnetic field can generate a magneitc field, in which the magnetic field lines is closed around the electric field line. C: The magnetic field lines is closed themselves. D: Flux continuity
- The<br/>magnetic field lines are used to visually describe the distribution<br/>of the magnetic field around the magnet. For the following<br/>statement,( <br/>) is wrong. A: Each<br/>magnetic field line is a closed loop curve B: No<br/>two magnetic field lines can cross each other C: The<br/>length of the magnetic field line reflects the strength of the<br/>magnetic field D: The<br/>tangential direction of any point on any of the magnetic lines is the<br/>direction of the magnetic field at that point
- There is no magnetic field in an ideal conductor, but there is a magnetic field inside because of the surface current。
- There is no magnetic field in an ideal conductor, but there is a magnetic field inside because of the surface current。 A: 正确 B: 错误