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Three different powers of high-intensity ultrasound are introduced into molten Sn-Sb peritectic alloy to study the refining effectiveness.

Sb过包晶合金进行了试验研究，考察了不同凝固速度条件下获得的凝固组织、相的形貌及初生相体积分数的变化。

The left ventricle ponderal index (92.35±19. 03) and LVEF [ (50. 14±7. 23)%] of GH low level group were lower than those of normal level group (P. 05 all). Conclusion; There is significant influence of GH on aged cardiovascular system. Growth hormone ; Cardiovascular system ; Aged

本研究对老年人血液生长激素水平和心室壁厚度以及心脏射血分数的关系进行分析，探讨生长激素水平对心功能的影响。1资料与方法1.1一般资料研究对象均为1999～2001年我院住院的患者，男72

In this review, I discussthe physical principles behind the PISA method, along with thevarious mathematical formulas used to calculate the effectivemitral regurgitant orifice area, the regurgitant volume, andthe regurgitant fraction.

在本综述中，我讨论了 PISA 方法后面的物理学原理以及用于计算有效二尖瓣返流口的面积、返流量和返流分数的各种数学公式。

The results showed that any consistency of clove alcohol extracts could decrease the respiratory intensity and weight loss, delay the decline of vitamin C, soluble solids and titratable acidity contents.

结果表明：不同体积分数的丁香乙醇提取液均可在不同程度上降低草莓的呼吸强度、减少水分损失，延缓草莓VC、可溶性固形物及可滴定酸含量的下降。

Furthermore, the emphasis schools put on grades prevents healthy learning, evenif it coaxes you into quickie learning.

更重要的是，学校强调分数的做法妨碍了健康的学习，即便这做法能引诱你尝试速成式学习。

The decay of SO·4- decelerates with increasing volume fraction of ACN in mixed media whereas the decay of TyrO· accelerates.

随介质中乙腈体积分数的增加，SO·4-的衰变速率减慢而酪氨酸中性自由基的衰变速率加快。

An educational environment without grades would promote more genuine intellectual development.

一个没有分数的教育环境会促进真正的学术文化的发展。

An educational environment without grades would promote more genuine intellectual development.

没有分数的教育环境将会促进更多人的智力潜能的开发。

The content of conjugated dienes in petroleum products is determined by ultraviolet spectrophotometry.

在化学反应－气相色谱法联合测定含烯汽油中共轭二烯烃质量分数的基础上，建立了用紫外分光光度法测定油品中的共轭二烯烃的含量。

Worst最糟糕的– Zero is the worst mark you can get.

零分是你所能得到的最糟糕的分数。

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％。