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【单选题】Music to My Ears When other shad doubts, my father believed in me. As a boy growing up in Shenyang, China, I practiced the piano six hours a day. I loved the instrument. My mother, Xiulan Zhou, taught...
A.
The whole family moved to Beijing.
B.
He and his father went to Beijing to learn piano.
C.
His mother got iii.
D.
His family objected to his learning in Beijing.
【单选题】TB/T2658.21-2007标准规定，当用双探头法探测铝热焊焊缝时，应对焊缝全宽度进行连续扫查或分段扫查。分段扫查宜从焊缝两侧进行，也可从同侧进行，每段宽度一般不应大于（）。
A.
10mm
B.
15mm
C.
20mm
D.
25mm