混凝土搅拌机供水系统的指示水量与实际水量的一致性，当误差超过（）时，应检查管路的漏水点，或应校正节流阀。
A、1%
B、2%
C、3%
参考答案：B
An analyst does research about the difference between International Financial Reporting Standards (IFRS) and U. S. generally accepted accounting principles (GAAP). With respect to the classification of interests received on the statement of cash flows, U. S. GAAP is:（）
A. less flexible than IFRS.
B. equally flexible as IFRS.
C. more flexible than IFRS.
甲、乙合干某项工程需要4.8天．
(1)甲干2天、乙干3天可完成总数的；
(2)甲干1天，乙干2天课完成总数的．
；
．