气孔的

The variation of stomata numbers,epidermis thickness and stomata chamber were investigated among the tested provenances;the provenances from Miyun of Beijing and Fugu of Shaanxi Province were more xerophilous.

种源间在鳞叶下表面气孔密度、表皮厚度和孔下室深度等方面有显著差异，属北方种源的北京密云和陕西府谷的鳞叶旱性结构特点更为突出。

As the weld deep and narrow, fast cooling rate, weld porosity generated in the process may not have enough time to escape from the melting zone.

由于焊缝深而窄，冷却速度又快，焊接过程中产生的气孔不一定有足够的时间从熔化区逸出。

Reduce the melting zone porosity methods include: welding pre-cleaning, welding process using inert gas welding area and selection of the full protection of the lower cooling rate of the welding parameters.

降低熔化区气孔率的方法包括：焊前清洗、焊接过程中用惰性气体充分保护焊接区和选择较低冷却速度的焊接参数。

It is shown through test results when concrete was curing in 50°C and the air content maintained 4% or so, the percentage expansion and pore constructer parameters have few changes.

试验研究表明，当蒸养恒温温度为50℃，混凝土含气量控制在4%左右时，蒸养后混凝土的膨胀率，气孔结构参数的变化都不大。

This method of shipping is very common for moving turtles in cushioned, insolated boxes with air holes.

这种运输方式是很常见的迁入海龟缓冲，与空气孔孤立的框。

The changeable regularity and adaptation in different stages of photosynthetic rate, stoma conductance and intercellular CO2 concentration of Cynanchum komarovii that was planted in PVC tube were studied under water stress.

采用PVC管种植模拟土壤干旱的方法，研究了牛心朴子在水分胁迫下光合速率、气孔导度、胞间CO2浓度、叶绿素荧光的变化规律及不同生育期适应性表现。

The amount of yeast has great influence on the porosities and flexural strength of the SiC porousceramics.

酵母粉的添加量也直接影响碳化硅多孔陶瓷的气孔率和抗折强度。

Low density silicon nitride with about 55% porosity and globed macropores was prepared by reaction-bonded raw silicon powder and adding 30% in mass pore-forming agent of benzoic acid ball-like particles.

以硅粉为原料，添加质量分数为30%的成孔剂球形颗粒，反应烧结制备了气孔率为55%，具有球形宏观孔的低密度多孔氮化硅陶瓷。

According the research, by inducing TiC into conventional carbon/ graphite materials, their flexural strength increased 13.4%, compressive strength increased 38.1%, void ratio decreased 16.9% in respective. The reason of the performance improvement is as follows: TiC decomposed during the process and hence Ti accelerate the graphitize process, which can increase the mechanical performance of the carbon/ceramic composite materials.

从研究结果可以看出，TiC掺杂可使碳陶瓷复合材料的抗折强度提高13.4%，抗压强度提高38.1%，气孔率降低16.9%；其机理在於TiC掺杂在碳陶瓷复合材料制备过程中能促进碳陶瓷石墨化，使晶体更加完整、细化，有利於力学性能的提高。

The "midday depression" of Guzmania could be attributed to the high temperature and radiation, which caused the partly closure of stomato and inhibition of photosynthesis.

高温、强光引起的气孔部分关闭及光抑制是导致观赏凤梨光合&午休&现象的主要原因。

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％。