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92.用于TP型扫描或B型扫描的最佳时基辉度调节是: A.在没有室内光线明显干扰下足以看得见的亮度 B.能够显示的均匀灰阶C.恰好低于可见度的阈限 D.其亮度足够抵消测径器标记的亮度93.脉冲周期和周期数的乘积是:
92. The best time-base brightness adjustment for TP scan or B scan is: A. Bright enough to be visible without noticeable interference from room light B. Uniform gray scale that can be displayed C. Just below visibility Threshold D. Its brightness is enough to offset the brightness of the caliper mark 93. The product of the pulse period and the number of periods is: