选择性的

From the starting material: propargyl alcohol, the building block was prepared easily by Jones oxidation, esterfication, bromination and selective trifluoromethylation.

第一部分：从丙炔醇出发，经过Jones氧化，甲酯化，顺式二溴化，再选择性地在酯基的β位实现三氟甲基化，合成了目标含氟砌块。

It is the first example to synthesize Z isomers of propenoic acids and their derivatives highly stereoselectively by the nucleophilic addition of a carbon- carbon triple bonds.

这种利用亲核试剂进攻碳-碳叁键以高立体选择性地合成丙烯酸及其衍生物的方法尚无前例。

The total selectivity of propionic acid and propionate is 85.51%,and ethanol conversion is 95.30%.

在试验条件下Ni-Cu/C催化剂对乙醇转化率为95.3％，丙酸＋丙酸乙酯的选择性为85.51％。

The stavudine was prepared from 5-methyluridine via six steps in 34% overall yield, in which the key step is the selective acylation of 5-methyluridine by propionyl chloride.

该路线以5-甲基尿苷为起始原料，关键步骤是5-甲基尿苷和丙酰氯的选择性酰化反应，六步反应总收率为34%。

Nitric oxide inhalation is a rapid, potent and selective vasodilator of pulmonar y circulation.

吸入NO是一种快速、有效的选择性肺血管扩张剂。

Selective angiography and embolization is an effective and safe therapeutic method for maxillofacial racemose hemangioma.

经选择性血管造影明确诊断后行栓塞治疗是颌面部蔓状血管瘤安全有效的治疗手段。

The conformation of the authorization system during the reform era is all-round authorization, inclined authorization, exceptional authorization, and selective recentralization of power.

改革时期的授权体制表现为全面授权、倾斜授权、个别授权、选择性集权等形态。

In the meantime, this also shows the net is filled planning to be advanced steadily optionally according to established development and buy a plan, measure ground has strategic position through capital market business affairs of electron of industry of a spin, garment " aircraft carrier ", and even " B2B electron business affairs is regnal ".

同时，这也表明网盛在按照既定的发展规划选择性地稳步推进并购计划，有步骤地通过资本市场进行战略布局一个纺织、服装行业电子商务&航母&，乃至&B2B电子商务王国&。

Methods 9 elective cardiac patients' blood lose was collected with ELMD-500 cell saver and washed prior to reinfusion.

采用ELMD-500自体血回收仪对9例选择性心脏手术病人的手术出血进行洗涤回输。

Selective femoral circumflex artery and retinacular artery DSA is an important technique for assessment of femoral head blood circulation and investigation on its influent factors after femoral neck fracture. We can predict the possibility of avascular osteonecrosis of the femoral head after femoral neck fracture and then provide effective treatment at the early stage of femoral neck fracture.

骨折早期选择性旋股动脉及支持带动脉造影技术可以评价早期股骨颈骨折后股骨头血液循环损伤情况，对早期预测股骨头坏死的可能性有重要价值。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。