A PhaseⅡ of Injection for Recombinant Human Tissue Plasminogen Kinase Derivative in Treatment of Acute Ischemic Stroke.

"Drug: r-PA Dose: stick 18 mg;~Mode of admin:~The high-dose group (18 mg + 18 mg) was divided into two intravenous injections. the first intravenous bolus injection of 18mg,after 30mins, the second intravenous bolus injection of 18 mg, Push slowly for more than 2mins each time."

"Drug: r-PA Dose: stick 18 mg;~Mode of admin:~The low-dose group (12 mg + 12 mg) was divided into two intravenous injections, the first intravenous bolus injection of 12 mg, after 30mins, the second intravenous bolus injection of 12 mg, Push slowly for more than 2mins each time."

"Drug: Alteplase for Injection Dose:50mg; 20mg~Mode of admin:~0.9 mg/kg (maximum dose of 90 mg) intravenous, 10% of which was injected intravenously within the first 1min, and the rest continued intravenous infusion for 1 h."