3. Among the following four propositions:
(1) If $|a|=|b|$, then $a|a|=b|b|$;
(2) If $a^{2}-5 a+5=0$, then $\sqrt{(1-a)^{2}}=a-1$;
(3) If the solution set of the inequality $(m+3) x>1$ is $x>0$, then the equation has one positive root and one negative root, and the absolute value of the negative root is larger. The number of correct propositions is ( ).
(A) 1
(B) 2
(C) 3
(D) 4
3. (C). Proposition 1 is not true; Propositions $2,3,4$ are true.