查询词典 D

The system is composed of MCU, A/D converter, D/A converter and power amplifier.

系统由单片机、 A/D 转换器、 D/A 转换器和功率放大器组成。

And gives a simple introduce to SCM AT89C52 and A/D, D/A converter.

并对所用到的单片机89C52及A/D、D/A转换芯片作简单的介绍。

Based upon our first paper and continuing the "Standard candle" classification by use of the component linear distance D, we attain to the following statistical correlation of some type of Quasars with largest angular diameter Q_: the correla- tion between visual magnitude and redshift; the correlation between its absolute magnitude, radio-luminosity of single frequency, integral radio Iuminosity, colour in- dex difference Q and D.

本文在第I部分的基础上，继续用类星体射电子源线距D进行"标准烛光"分类，经过统计分析，得到了子源角径最大的一类类星体的一些统计规律：它的视星等与红移之间，它的绝对星等、单频射电光度、积分射电光度和色指数差Q与D之间有很好的相关性等。

Definition 4 Let D be the domain of the function of two variables , be a point of accumulation of D.

定义4 设二元函数的定义域为D，是D的聚点。

Definition 3 Let D be the domain of the function of two variables, be a point of accumulation of D and .

定义3 设二元函数的定义域为D，是D的聚点，且。

Method］mscs(5×106) were cultured combining with gdabm in vitro in centrifuge tube, tgf β was added to collagen and attached to gdabm. culture tube was centrifuged in 600 r/min, 10 times/d, 10min per time. the morphological characters, cell proliferation were detected.

方法］将 mscs与复合转化生长因子-β的胶原共同混合后培养于三维软骨支架材料上，离心管内培养，10次／d，以600 r／min离心10 min.8 h、24 h、72 h、 4 d、7 d进行倒置显微镜形态学观察、扫描电镜观察。1～8 d采用mtt法检测细胞增殖活性，描绘生长曲线。

The 4th left rib was cut and a model of left coronary artery occlusion/release was carried outo Rats were divided randomly into 4 groups: control group without LCA occlusion (group A, n=6);I/R group(group B, n=6); ketamine(5mg.kg-1)+I/R group (group C, n=6); ketamine(10mg.kg-1)+I/R group(group D,n=6)o All rats in groups B, C , D were subjected to 30 minutes of LCA occlusion followed by 120minutes of reperfusion. Rats in group C and D were injected with 5mg.kg-1 and 10mg.kg-1 of ketamine before reperfusion, respectively. Significant electrocardiogram and color changes at the area at risk were considered indicative of successful coronary occlusion and reperfusionc Serum was exampled from left jugular vein at 30 minutes and 120 minutes during reperfusion to measure IL-6 and TNF- level by ELISA measurements. After reperfusion of 120 minutes, the heart was removed and the cardiac apex was exampled with snap-frozen in liquid nitrogen and stored at -70 C .

采用左冠状动脉前降支结扎开放建立心肌缺血／再灌注模型，健康SD大鼠24只，随机分为心包打开假手术组(A组，n=6)，缺血／再灌注对照组(B组，n=6)，5 mg·kg~(-1)氯胺酮+缺血／再灌注组C组，n=6，缺血30min后右腹股静脉注入5 mg·kg~(-1氯胺酮，10mg·kg~(-1)KTM+I／R组D组，n=6，缺血30min后右腹股静脉注入10 mg·kg~(-1氯胺酮。10％水合氯醛40 mg·kg~(-1)腹腔注射麻醉，气管切开，连接多功能监护仪记录心电图；小动物呼吸机人工呼吸，呼吸频率60次／分，潮气量2ml／100g，于左胸第四肋间打开胸腔暴露心脏，在左心耳下1mm左冠状动脉处，用丝线，眼科外用不锈钢小圆针穿过心肌浅层，稳定10min后将U型含有铜丝的胶管置于冠状动脉表面一起结扎(A组不结扎，B、C、D组结扎)；结扎开始左心室心尖部即由红色变暗，30 min后呈暗红色，心电图中出现S-T段抬高，说明缺血形成。

The first fiction writer in the United States to achieve international fame was A B C Washington Irving, who wrote many stories, included " Rip Van Winkle" and "The Legend D of Sleepy Hollow".

key：D 分析：第一步分析空前后的关系，发现D出现错误，应该表主动才对。必要知识点：考点是分词结构。D前面已经是一个完整的句子，D改为including做伴随状语，说明前面的主句。

The recommended leel of serum itamin D is the leel at which the parathyroid leel does not become hyperactie, but we now know that itamin D affects not only the parathyroid gland, but all these other systems in the body, and it appears we need een higher leels to hae a positie effect on these other systems, he said.

骨质疏松症的妇女维生素D推荐摄入量为1200单位/天。&他解释到，&这个标准的制定是在无甲状旁腺功能亢进时的维生素D水平。但是进一步的研究结果显示高剂量的维生素D对于全身的其他器官有着积极的作用。

And perhaps the most rapid clinical application of these results will be in both cosmetic and reconstructive plastic surgery, said co-author Stephen Baker, M.D., D.D.S, associate professor of plastic surgery at Georgetown University Hospital.

这也许是最迅速的临床应用这些成果将在美容和整形美容，说合著斯蒂芬贝克医学博士，d.d.s副教授整形外科在乔治敦大学医院。

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％。