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网线制作（水晶头的制作）步骤：
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测试网线的连通性用到的仪器是：
A business opens on 1 January 20X4 in a shop which is on a 20 years lease. The rent is $20,000 per year and is payable quarterly in advance. Payments were made on what are known as the “quarter-days” (except the first payment) as follows.What will the rental charge be for the year ended 31 December 20X4?
Android安装包文件简称APK,其后缀名是( )。
onActivityResult()方法有三个参数,其中( )表示在返回数据时传入结果码。
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