\(a\),\(b\),\(c\)是空间中互不重合的三条直线,下面给出五个命题\(;\)命题中正确的是________\((\)只填序号\()\).
\(①\)若\(a/\!/b\),\(b/\!/c\),则\(a/\!/c\);
\(②\)若\(a⊥b\),\(b⊥c\),则\(a/\!/c\);
\(③\)若\(a\)与\(b\)相交,\(b\)与\(c\)相交,则\(a\)与\(c\)相交;
\(④\)若\(a⊂\)平面\(α\),\(b⊂\)平面\(β\),则\(a\),\(b\)一定是异面直线;
\(⑤\)若\(a\),\(b\)与\(c\)成等角,则\(a/\!/b\).