查询词典 Ac.

Based on the fictitious crack model and critical crack tip opening displacement CTODc, the precritical crack propagation length △ac of concrete was determined by means of three point bending beams. According to the calculation value of △ac, the effective fracture toughness KunIc of concrete was evaluated.

本文采用虚拟裂缝模型，将临界裂缝尖端张开位移CTODc作为控制参数，利用三点弯曲梁试件通过迭代求得了混凝土裂缝亚临界扩展量的临界值△ac，据此求得了混凝土起裂断裂韧度KiniIc、等效断裂韧度KunIc值。

The results showed that the frequency of germination were able to be increased by keeping seed vessel, culturing seeds with radicle up and pre-treating seeds in 5.0mg/L GA3 solution for 12h. The frequency of explant-browning was reduced by adding AC 0.5mg/L to induction media and the vigor of plantlets was promoted by the AC-adding. The propagating coefficient could be improved and the frequency of bud-vitrifration increased by adding 150mg/L coconut water.

结果表明发芽时保留种皮、接种时胚根向上对蚕豆种子的萌发有着至关重要的影响，用5.0mg/L GA3溶液浸种12h有利于种子萌发；培养基中添加0.5g/L AC能有效抑制外植体的褐化，并能使植株生长健壮；培养基中添加150mg/L椰汁能提高繁殖系数，有效抑制玻璃苗的发生。

The results show that the optimum preparation conditions of CuO/AC catalyst are as follows:the concentration of Cu（NO3）2 is 3%,soakage temperature 30 ℃,soaking time 6 h,calcinating temperature 300 ℃,and calcinating time 3 h.

研究结果表明，硝酸铜-AC制备CuO/AC催化剂的最佳条件为：硝酸铜质量分数为3%，浸渍温度为30 ℃，浸渍时间为6 h，焙烧温度为300 ℃，焙烧时间为3 h。

The results indicated that:(1) There was a distinct difference in the same syllogistic inference(MP、DA、AC���MT)of three concrete propositions and in every concrete proposition s four syllogistic inferences(MP、DA、AC���MT).

结果表明：(1)对同一年级而言，不同内容的条件命题的相同推理(MP、MT、DA、AC)之间表现出显著的差异；对不同年级而言，相同内容的条件命题的四种推理之间也存在显著的差异。

Two dimensional fluid simulation results show that the wall voltage across the sustaining gap is increased by 30V, and the sustaining voltage can be lowered by 10-20V with the new triggering method. The vacuum ultra-violet radiation efficiency is increased by more than 50% compared to the conventional three-electrode AC PDP.

二维流体模拟结果表明，新的触发驱动方法可将五电极AC PDP主维持间隙的壁电压提高30V左右，从而使其维持电压降低了 10~20V，降低了对驱动电路的要求，同时真空紫外辐射效率比传统三电极AC PDP提高了50%以上。

Antioxidants of 100 mg/L PVP, 100 mg/L Vc and sorbent of 500 mg/L AC can control browning efficiently. PVP and Vc restrain callus growth, whenas AC can stimulate it.

5mg/L GA3为组培苗的最佳生根培养基，生根率达100%；一定浓度的PVP，Vc或者AC能有效控制褐变现象的发生。

These observations suggest that PVA-MEC is an excellent fluorescent macromolecular material with a convenient method of preparation and had a good water-soluble ability.(2) An acrylic monomer bearing xanthene group, acryloyl-fluorescein was synthesized from fluorescein and acryloyl chloride. The photophysical behaviors of Ac-Flu and its copolymer were explored by recording the fluorescence spectra in solution, solid state and film in detail.

2我们采用基于荧光功能单体制备荧光聚合物的方法，选择荧光素为发色团，使它与丙烯酰氯反应，合成出含有双键的荧光素单体Ac-Flu，然后令其与丙烯酰胺共聚，制备得到含有荧光素生色团的水溶性荧光聚合物poly(Ac-Flu-co-AM)。

Electric power is output to the oil tube,which is connected with the bushing by the oil bushing connecter on the bottom of the oil tube,via a 3-phase transformer after AC-DC-AC inverse circuit .

电能由三相配电变压器经AC DC AC 逆变电路输出传送到油管，经油管下部的油套管接触器连接到套管，形成一个完整的回路。

The thesis mainly researches on the single phase AC/AC converter in the topologies including AC_Buck and AC_Cuk. Firstly, the operating principles of the two converters are analyzed in detail and the rules of their parameters design are educed; The commutation of their power switches which is the key of these topologies to realize is analyzed in detail and a feasible solution which can be named RCD-Commutation mode is presented and proved effectual by theory analyses and simulation results.

本文首先分析了AC_Buck变换器的变换原理，得出了电路参数设计准则；继而对电路实现的难点即功率管换流问题进行了深入分析，并得出了一种可行的解决方案即RCD换流方案；作为对简单拓扑单相直接AC/AC变换器控制策略的探索，本文以AC_Buck为平台，对电压单闭环瞬时值控制方案进行了研究，在理论分析和仿真研究的基础上设计并制作了一台采用RCD换流、电压单闭环瞬时值控制的AC_Buck变换器原理样机。

Inter forward Mario Balotelli has been seen attending AC Milan's Italian Cup last game against Third Division team Novara: after the match he had a quarrel with an AC Milan supporter, during which he reaffirmed his rooting for Rossoneri squad.

国际前锋马里奥巴洛特利被人在现场发现他观看了AC米兰在意大利杯最近一场对阵第三季联赛队伍诺瓦拉的赛事：赛后他与AC米兰的拥趸发生了些争执，期间他重申了自己是红黑球迷的立场。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。