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1)  four-transformation
四个转向
1.
Promoting the teaching reform needs to implement "the four-transformation",that is,from "knowledge teaching" to "ability acquisition" on course reform;from "theory teaching" to "practical training" on teaching method;from "major setting" to "skill tamping" on major construction;from "teacher-based system" to "trainer-based system"on the construction of teaching staff.
推进警察院校教学改革需要实施"四个转向":即在课程改革上,要从"学科本位"转向"能力本位";在教学方法改革上,要从"理论教学"转向"训练教学";在专业建设上,要从"专业对应"转向"技能打牢";在师资队伍建设上,要从"教师制"转向"教官制"。
2)  Foru-aspeet Services
四个面向
3)  four dimensions
四个向度
4)  Four Changes
四个转变
1.
According to emerging conditions and problems of the development of forest tree seeds and seedlings since the forest tenure reform had been carried out,this paper had a discussion on the "Four Changes" of forest seed and seedling development in the future.
针对林改后林木种苗出现的新情况、新问题,本文提出实现林木种苗的"四个转变",是增强林改成效的基础和保障。
5)  five shifts
五个转向
6)  Four-wheel steering
四轮转向
1.
Analysis of four-wheel steering vehicle locomotion sunulation;
四轮转向车辆运动仿真分析
2.
Control of four-wheel steering vehicle based on neural network;
基于神经网络的四轮转向车辆控制研究
3.
Integrated Control of Vehicle Four-Wheel Steering and Active Suspension Systems
汽车四轮转向和主动悬架的综合控制研究
补充资料:1,3,5,7-四甲基四乙烯基环四硅氧烷
分子式:[CH3(CH2=CH)SiO]4
CAS号:

性质:沸点224~224.5℃(101.06kPa)。熔点-43.5℃±0.1℃。相对密度0.9875。折射率1.4342。与八甲基环四硅氧烷性能相似,在微量硅醇钠、硅醇钾或少量浓硫酸作用下,Si-O-Si键断裂重排,生成直链的聚硅氧烷和环状硅氧烷的混合物。  Si-CH=CH2键在有机过氧化物存在下,可进行游离基聚合反应。在铂催化剂存在下,可与Si—H键发生加成反应。可由甲基乙烯基二氯硅烷的水解料催化裂解来制取。用来合成有机硅中间体及高分子化合物提供活性交联点之用,是制备硅橡胶不可缺少的原料之一。

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