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"。
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。
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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参考词条