Simulation and experimental studies _____, which show that the axial ratio bandwidth of the antenna is directly proportional to the thickness of the substrate.
A、have been performed
B、is performed
C、was performed
D、were performed
A、have been performed
B、is performed
C、was performed
D、were performed
A、Liu Baoquan
B、Bai Yunpeng
C、Zhang Xiaoxuan
D、Luo Yusheng
A、Its tail
B、Its teeth
C、The shape of its skull
D、Details of its bone structure
A、They think it's a good way to relax.
B、They feel their life is empty and meaningless.
C、They do not have a serious attitude toward life.
D、They do not know how to strike a balance between study and play.
A、Include too many points on a slide.
B、Never use too many colors and fonts.
C、Slides with dense graphics will distract or confuse your audience.
D、Avoid sound effects, distracting backgrounds
A、is able
B、will be able
C、has been able
D、have been able
A、have ever seen
B、has ever seen
C、ever has seen
D、had ever seen
A、considerably better
B、more better
C、well
D、much well
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