C5 Trang 70 Sgk Vật Lí Lớp 7

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The origin web server does not have a valid SSL certificate.

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The SSL certificate presented by the server did not pass validation. This could indicate an expired SSL certificate or a certificate that does not include the requested domain name. Please contact your hosting provider to ensure that an up-to-date and valid SSL certificate issued by a Certificate Authority is configured for this domain name on the origin server. Additional troubleshooting information here.

Cloudflare Ray ID: 9c67ce790ef0fce8 • Your IP: Click to reveal 103.110.85.167 • Performance & security by Cloudflare

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