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[单选题]
根据JG/T203-2007标准规定,C级检验时,至少采用()角度探头进行()检查。
A.一种,单面双侧
B.两种,单面双侧
C.两种,双面单侧
D.两种,双面双侧
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A.一种,单面双侧
B.两种,单面双侧
C.两种,双面单侧
D.两种,双面双侧
A.15mm
B.20mm
C.30mm
D.75mm
A、DAC、DAC-10dB、DAC-16dB
B、DAC-2dB、DAC-8dB、DAC-14dB
C、DAC-4dB、DAC-10dB、DAC-14dB
D、DAC-4dB、DAC-10dB、DAC-16dB