问题 单项选择题

为了消除百分表、千分表齿轮啮合间隙对回程误差的影响,由片齿轮在游丝产生的扭力矩的作用下与()啮合,使整个传动机构中齿轮在正、反转时均为单面啮合。

A、轴齿轮

B、中心齿轮

C、片齿轮

D、传动齿轮

答案

参考答案:B

单项选择题 A3/A4型题
写作题

假如你是高中生李华,请根据以下要点,以日记的形式,叙述你在11月15日(周六)参加在乡下橘子采摘节(Orange-picking Festival)的活动情况。

你到达橘园的方式,时间,及当时的天气状况;

你在橘子采摘节的所见所闻。

注意:日记格式已给出;词数120左右;可适当增加细节以使行文连贯

Saturday, Nov.15                                               Sunny

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