The first China Youth Olympic Skills Competition
First, the judgment question (correct snoring, wrong hit ×) (1) normal straight corridor (zN worm) also known as Archimedes worm. ........................( ) (2) When the modulus and diameter of the worm are the same, the lead of the three-wire worm is larger than that of the four-wire worm. ........................ ( ) (3) A thread formed along two or more spirals equidistantly distributed in the axial direction is called a multi-thread thread. ........................( ) (4) Threading fit, mainly on the two sides of the thread. Therefore, the main dimension affecting the mating properties is the actual size of the thread diameter. ........................( ) (5) When measuring the thread with three needles, the diameter of the steel needle must be tangent to the medium diameter flank. ........................( )