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汇票和票汇的区别是:前者是支付工:具,后者是支付方式。( )
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D/P·T/R的风险大于D/A。( )
买卖双方按D/P·T/R条件成交时,如日后汇票到期收不回贷款,代收行应对卖方负责。( )
（For each blank there are four choices marked A), B), C) and D). Decide which is the best answer, then mark the answer on the line. 15×2 points）Operating systems for micro, mini, and mainframe computers perform many services. These services can be1either as “external” or “internal.” The operating system provides external services that help2start programs, manage stored data, and maintain3. You, as the computer user, control these external4. Using a command-line, menu-driven, or GUI user 5, an operating system provides you with a way to select the 6 you would like to use. The operating system also helps you find, rename, and delete7and other data stored on disk or tape. On many, but not all computer 8, the operating system helps you maintain security by checking your user ID and 9, as well as protecting your data from10access and revisions.The 11system provides internal services “behind the scenes” to ensure that the computer system functions 12. These internal services are not generally under your control, but instead are controlled by the operating system itself. The operating system controls 13and output, allocates system resources, manages the 14space for programs and data, and 15equipment failure without any direction from you.
Java程序以___为基本单位，它是具有某些共同特性实体的集合，是一种抽象的概念。
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