指示器

A light pointer is often useful with a slide projector.

光指常与幻灯片放映机一起使用。

Recording of the sweatiness of their fingertips (a physiological indicator of emotional reactivity) also supported their claims.

她们的指尖排汗（情感反映的生理指）记录也支持了研究人员的观点。

A floorstand for handwheel actuated valves allows operation from above.Included is handwheel, non-rising stem, fittings, extension, and floorstand with gate position indicator.

用于手轮执行阀门的地轴承架可在方对阀门进行操作，包括手轮，暗杆，连接件，加长件，及带闸板位置指的地轴承架。