单项选择题

Windows优化大师提供的文件系统优化功能包括（ ）
     ①优化文件系统类型  ②优化CD/DVD-ROM  ③优化毗邻文件和多媒体应用程序。
            A、①②     B、②③     C、①②③      D、①③
A、①②
B、②③
C、①②③
D、①③

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Which of the following statements is not true of a trial balance?______.A.A trial balance is a list of balances of ledger accounts worked out periodically.B.A trial balance can detect an omission in the recording of the accounting datA.C.A trial balance provides an accuracy check by showing whether or not total debits equal total credits.D.If total debits do not equal total credits in a trial balance, accounting error has occurred somewhere in journalizing or posting.
A.A.A
B.
B.A
C.
C.A
D.
D.If
E.
单项选择题
压电式传感器适宜于动态测量，不适合测量动态的力、压力、加速度、振动等参数。（ ）
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