positive infinitely variable unit

Digestive tract of Gyllotalpe Unispina Sausure had special histology, there were protruding long crest on all inner wall Of digestive tract and thick short tooth in its cavum oris and pharynx, some compact thin long thom lied on gastric caecus and preventriculus, there are microvilli on its esophagus, crop and postintestine, many blunt thom were on the rectum.

本文采用組織學技術對華北螻蛄消化道的組織結構進行了研究其消化道具有特殊的組織結構，消化道各部的內壁均有隆起的縱脊；口腔和咽上有較粗的短齒；胃盲囊、前胃上有排列緊密的細長刺：食道、嗉囊及后腸上均有紋狀緣：盲腸上生有成群的純利此項研究為講一步防治病蟲害提供了依據。

The expressions of plane and space conjuration gear forms and meshing line of a single thread twin screw pump are derived on the basis of spatial meshing theory, and the equations for original gear forms and space spiral plane are given.

根據嚙合理論推導了ＨＳＢ４００／２型單頭雙螺桿式油氣混輸泵的平面和空間共軛齒形型線方程及嚙合線方程。

The results show that the inner walls of the esophagus consist of longitudinal ridges, with teeth at the front tip.

結果表明,中華稻蝗食道內壁由縱行脊組成,前端有齒。

This article mainly deals with the teeth s morphological characters of Oxya chinensis inner alimentary canal, which are observed through scanning electron microscope.

本文采用掃描電鏡觀察了中華稻蝗消化道內壁齒的分布和結構,發現食道的兩端有稀少的齒,而嗉囊ZⅡ和ZⅢ區齒粗和長,并且分布在脊的頂端,縱行排列,該區的齒較為密集。

The two members,Ya(牙) and Chi(齒),in the semantic field of tooth in the Chinese documents of Wei-Jin(魏晉) Dynasty was investigated.

"牙齒"是語言中最核心的詞之一。

Introduces the control structure and its diagram of numerical control gear shaper based on PLC.

闡述了基于PLC的數控齒條插齒機控制結構,給出了系統結構示意圖,并詳細介紹了數控齒條插齒中通用性、間隙誤差和沖程數等關鍵控制技術,結合實例對各項技術的應用作了簡要分析。

The design of self-lock mechanism in gear and rack;

一種齒輪齒條自鎖機構的設計