SELECT COUNT(moment_of_inertia_in_torsion__j___cm_4__) FROM table_2071644_1 WHERE web_thickness__mm_ = "4.7"
Berapa angka untuk momen inersia dalam torsion (j) (cm 4) untuk ketebalan web 4.7 (mm)?
CREATE TABLE table_2071644_1 (moment_of_inertia_in_torsion__j___cm_4__ VARCHAR, web_thickness__mm_ VARCHAR)