超声波中，当X≥3N时，横通孔的反射与长横孔直径的（）成正比，与距离的3/2次方成反比。
参考答案：平方根
James Schneider & Co. have written to us that they are the leading importer in your place dealing ______ chemicals.
A．with
B．in
C．about
D．for
