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【简答题】
利用脉冲回波法测,若已知超声波在工件中的声速 c =3040m/s,测得的时间间隔 t 为 56us,则工件厚度为 mm。
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A.
amaze; amazing
B.
amazing; amazed
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amazed; amazing
D.
amaze; amaze
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is angry for, find out
B.
was angry with, found out
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is angry with, find out
D.
was angry with, find in
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it was something in
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there was something as
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it was something as
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there was something in
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was of his
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was of him
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did him
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did of his
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