单项选择题 The Customs surveillance zone include the following places except （）.

单项选择题 Concerning the payment for the machines to be imported by us, we suggest that we make payment ______ three annual installments without interest.

单项选择题 配额与许可证这两种限制措施既可单独采用，也可以结合在一起使用，我国目前采用的是( )。