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单选题
Many altimeters contain linkages that rotate a numerical counter in addition to moving pointers around the dial. A quick reference window allows the pilot to simply read the numerical altitude in feet. The motion of the rotating digits or drum-type counter during rapid climb or descent makes it difficult or impossible to read the numbers. Reference can then be directed to the classic clock-style indication.
A
许多高度表都包含了连接机构，它们不仅可以使指针在游标上移动，还可以旋转数字计算器。快速参考窗口使飞行员可以简单地读取以英尺为单位的数字高度。在快速爬升或下降时旋转数字或滚筒式计算器的运动使数字难以阅读或无法阅读。此时可以用经典的时钟式表做基准。
B
许多高度表都包含了连接机构，它们不仅可以使指针在游标上移动，还可以旋转数字计算器。快速参考窗口使飞行员可以简单地读取以英尺为单位的数字高度。在快速爬升或下降时旋转数字或滚筒式计算器的运动使数字难以阅读或无法阅读。此时可以用经典的时钟式表做基准。
C
许多高度表都包含了连接件，它们不仅可以使指针在刻度盘上移动，还可以旋转数字计数器。快速参考窗口使飞行员可以简单地读取以英尺为单位的数字高度。在快速爬升或下降时旋转数字或滚筒式计数器的运动使数字难以阅读或无法阅读。此时可以通过经典的钟表式指示来进行参考。
答案解析
正确答案：A
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