In ultrasonic B-scan imaging testing, pseudo-images which lead to inaccurate results can often ap-pear due to the influence of ultrasonic multiple reflections.
超声b扫描成象检测中，由于超声多次反射的影响经常出现伪象，导致检测结果不准确。
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AP plays important roles in floral development. As a B class gene of "ABC" model, AP or PI and AG control the development of stamen together.
The level and the requirements of the AP physics B are the same as physics course in senior high school in China. Students can deal with easily if they take the AP courses.