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1.A cranklike handle with an adjustable aperture at one end for securing and turning a bit.
手摇曲柄一种在一端带有可调节的孔以抓住和转动钻头的曲柄状把手收藏指正
2.Phenol alkylating catalyst has experienced a succesion of variations from liquid acid to oxide to ion exchange resin, zeolite molecular sieve as a kind of new alkylating catalyst, with it unique structure and characteristics and adjustable sourness, aperture and etc, become a relatinely ideal catalyst.
摘要苯酚烷基化催化剂的发展经历了由液体酸、氧化物到离子交换树脂的演变过程，沸石分子筛作为新型烷基化催化剂，以其独特的结构和可调变的酸性及孔径等特点，是比较理想的催化剂。收藏指正
3.rear gunsight having an adjustable eyepiece with a small aperture through which the front sight and the target are aligned.
瞄准器的后部有一个带有小孔的可调整目镜，通过它前方的景物和目标能够排成一条线。收藏指正
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