Status of first molar space closure, tooth alignment, occlusal relationship, soft tissue lateral profile after treatment were evaluated.
对治疗后第一磨牙间隙关闭情况、牙关系和侧貌进行评价；
Objective: To study if closing obsolete molar space could cause severe resorption of alveolar crest through comparing the height of alveolar crest before and after closing obsolete molar space.
目的：通过对正畸关闭陈旧性磨牙间隙前后牙槽嵴高度的对比，探讨关闭陈旧性磨牙间隙是否加重牙槽嵴吸收。
It's very important to make a space maintainer if the second deciduous molar is lost too soon.
假如第二颗乳牙过早脱落，那摸装上间隙保持器是件要紧的事。
In order to improve stability of catalyst, some process methods, such as increasing CO_2 and CH_4 molar ratio, gas space velocity, and reaction temperature, were adopted.
提高原料气中CO_2与CH_4摩尔比，气体空速，反应温度可以提高催化剂稳定性，减缓催化剂的失括速度。
The effects of temperature, the ratio of ammonia, the ratio of air and the space velocity of catalyst upon the conversion, molar yield and selectivity of the reaction were observed, respectively.
考察了反应温度、氨比、空气比和空速对反应的转化率，摩尔收率和选择性的影响。
The effects of catalyst composition, reaction temperature, space velocity, molar ratio of methanol to water, and reaction time on the performance of the microchannel reactor were investigated.
考察了催化剂涂层的配比、反应温度、水醇比、进料速度、反应时间对甲醇重整微槽道反应器性能的影响。
The effects of reaction temperature, space velocity, molar ratio of water to methanol, and reaction time on the performance of the micro reactor were investigated.
试验研究分析了反应温度、进料速度、水醇比（水和甲醇的物质的量的比）、反应时间对甲醇水蒸气重整制氢微型反应器性能的影响。
The effects of reaction temperature, space velocity, molar ratio of water to methanol, and reaction time on the performance of the micro reactor were investigated.
试验研究分析了反应温度、进料速度、水醇比（水和甲醇的物质的量的比）、反应时间对甲醇水蒸气重整制氢微型反应器性能的影响。
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