判断题

《阳关三叠》第二段感情较为激动，弹奏时力度和速度要稍微提高。
正确
错误

答案：正确

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单项选择题

Which one of the following statements is correct concerning the payback period? （） A. An investment is acceptable if its calculated payback period is less than some pre-specified period of time. B. An investment should be accepted if the payback is positive and rejected if it is negative. C. An investment should be rejected if the payback is positive and accepted if it is negative. D. An investment is acceptable if its calculated payback period is greater than some pre-specified period of time.

单项选择题

假想投影画法是为了表示运动零件的极限位置或中间位置，把运动零件画在一个极限位置上，再用细点画线画出另一极限位置的假想投影，并注上尺寸。

A．对
B．错