我正在使用 acme 自动续订域证书，acme.sh生成的证书格式cer如下：/root/.acme.sh/ttt208.com_ecc/ca.cer。 nginx使用pem格式，是否可以让nginx使用该cer格式？这是 cer 文件：
[root@ops001 ttt208.com_ecc]# cat fullchain.cer
-----BEGIN CERTIFICATE-----
MIIETzCCAzegAwIBAgISBEDHABxB8KoNuolJmVul04xfMA0GCSqGSIb3DQEBCwUA
MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD
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zSXJ
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
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nLRbwHOoq7hHwg==
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIFYDCCBEigAwIBAgIQQAF3ITfU6UK47naqPGQKtzANBgkqhkiG9w0BAQsFADA/
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-----END CERTIFICATE-----