The velocity of the center of mass is constant in the absence of external forces.
在无外力时, 质心的速度是常量。

Mass transfer performance of gas absorption in hollow fiber porous membrane module
中空纤维多孔膜基气体吸收传质性能研究

Study on Coupled Mass and Heat in Absorption Refrigerating Device Using Waste Heat
余热制冷装置中氨吸收器热、质耦合数值研究

The expression of the relation between force, mass and acceleration is as follows.
力, 质量和加速度之间的关系表示如下。

Which of these has a negligible mass? Which mass of these is negligible in an atom?
在原子中，下列哪种微粒的质量可忽略不计?

Key words laser ablation crystal spectrometer mass ablation rate plane layer target.
关键词激光烧蚀质量烧蚀速率晶体谱仪平面层靶

The charm of public relationship have been gradually known and accepted by the mass.
公共关系学的魅力逐渐为人们所认识和接受。

The relationship of tooth mass and basal bone mass in the cases with dental crowding
牙列拥挤人群牙量和骨量的相关性研究

Abdominal pain,diarrhea,fever,abdominal mass were the common clinical manifestations.
临床表现以腹痛，腹泻，发热，消瘦以及腹部包块为常见

Ultrasonographic Diagnosis in Abdominal Mass with Mannitol Intestinal System Contrast
甘露醇肠系声学造影在超声诊断腹部肿块中的应用

The most common symptoms were abdomen mass, discomfort and gastrointestinal hemorrhage.
临床症状以腹部包块、腹部不适及消化道出血为主。

Wide local excision of the mass is the basic treatment for abdominal wall endometrioma.
局部广泛切除是治疗腹壁子宫内膜瘤的基本方法。

Are no mass graves exist, leaving only a stone, mass graves for the white mule monument.
现冢无存, 仅留石碑, 传为白骡冢碑。

Executing mass policy, mass rule education and the publicity work and education of mass.
进行群众政策、群众纪律教育和群众宣传工作教育。

Heat absorbed by a unit mass of material when it changes from a solid to a gaseous state.
一单位质量的固体为变成气体所吸收的热。

Unlike the regular mass, the Requiem mass has a very special movement associated with it.
不像那些通常的弥撒曲，安魂弥撒曲，有个很特别的乐章

Pyrite is more abundant and cobaltiferous and occurs in heavy patches in the sulfide mass.
黄铁矿很多, 并且含钴, 在硫化物块体中成稠密得斑块。

The truth is, anything with an accelerating mass has a gravitational effect. Detecting it ?
任何有质量的物体加速运动都可以产生引力波。

Temperature Control Measurement for Mass Concrete Construction under Abominable Surroundings
在恶劣环境条件下大体积混凝土施工温控措施

In comparison with the mass of the proton the mass of the electron is considered negligible.
与质子的质量相比，电子的质量可以忽略不计。

And signs include abdominal pain, ascites, abdominal distension and abdominal mass and so on.
和体征有腹痛, 腹水, 腹胀及腹部包块等。

The bigger the mass or the larger the intended acceleration, the greater the necessary force.
力越大, 加速度越大, 所需的力也越大。

Low mass delivers maximum acceleration on transients for the best reproduction of fine detail.
小的质量能在瞬变时提供最大的加速度，以便重现细节。

Research on New Technology of Measuring Mass Center of Mass and Eccentricity of the Projectile
测量弹丸质量, 质心和偏心距的新方法研究

Right upper quadrant pain, jaundice and abdominal mass were their major clinical manifestations.
最常见的临床表现为右上腹疼痛，黄疸及右上腹包块。