[多选] VPN服务器所使用的WAN微型端口有（）。

凭证式国债的发售起点及出售金额限制？ 华电《电力安全工作规程》（热力和机械部分）对从事高温、低温环境下作业人员的个人防护有哪些规定？ 公司卡内资金的来源途径？ 下列产品属农业转基因生物的有（） 转基因微生物产品。 转基因农产品的直接加工品。 转基因水产苗种。 含有转基因动物成份的添加剂产品。 Which maintenance functions can a GMDSS Radio Operator perform（）. The Operator can make fine internal adjustments to the transmitter as long as the output power does not change by more than one percent。 The Operator is responsible for ensuring that INMARSAT antennas are free of built-up soot and clear of obstacles。 All levels of maintenance must be performed by a licensed GMDSS Radio Maintainer。 The Operator may install an EPROM in order to ensure that the equipment continues to operate within legal constraint。 VPN服务器所使用的WAN微型端口有（）。