6.
已知直线\(m,l\),平面\(\alpha ,\beta ,\)且\(m\bot \alpha ,l\subset \beta ,\)给出下列命题:
\(①\)若\(\alpha /\!/\beta \),则\(m\bot l\); \(②\)若\(\alpha \bot \beta \),则\(m/\!/l\);
\(③\)若\(m\bot l\),则\(\alpha \bot \beta \); \(④\)若\(m/\!/l\),则\(\alpha \bot \beta .\) 其中正确的命题是\((\) \()\)