Second time around is difficult. Is the molecular movement irregular?

A, the poem "the new moon blows Ye Xiang" is a diffusion phenomenon, indicating that molecules are constantly doing irregular movements, so A is correct;

B, "second time around is difficult" because the distance between molecules is too far and the molecular force can't play a role, so B is wrong;

C, seeing that smoke is the movement of small solid particles in the air, and the molecular movement is invisible, so C is wrong;

D, the number of positive charges in the proton band in the nucleus is equal to the number of negative charges in the electron band outside the nucleus, so ordinary objects are uncharged, so D is correct.

So choose ad.