On the area-amplitude ultrasonic standard test blocks, the flat-bottomed holes in the blocks are:

Largest in the No. 1 block and smallest in the No. 8 block

Different in diameter, increasing by 1/64 inch increments from the No. 1 block to the No. 8 block

Drilled to different depths from the front surface of the test block

On the area-amplitude ultrasonic standard test blocks, the flat-bottom

1.	On the area-amplitude ultrasonic standard test blocks, the flat-bottomed holes in the blocks are:
A.	All of the same diameter
B.	Different in diameter, increasing by 1/64 inch increments from the No. 1 block to the No. 8 block
C.	Largest in the No. 1 block and smallest in the No. 8 block
D.	Drilled to different depths from the front surface of the test block
Answer» C. Largest in the No. 1 block and smallest in the No. 8 block