压下的

In the event of a sudden loss of cabin pressure, masks will descend from the ceiling.

在客舱突然失压的情况下，面罩会从天花板上脱落。

Objective To study the changes of cabin pressure during accidental leakage.

目的 研究载人航天器压力应急状况下尤其是舱壁穿孔时的舱压变化。

The three-rotor single phase variable voltage and speed motor possess the advantages of simple control, low price, and a wide range of variable speed, particularly good condition for heat scatter in lower speed running.

三转子单相调压调速电动机具有控制简单、价格低廉、调速范围宽等优点，尤其在低速运行下有较好的散热条件。

Numerical Simulation and Experimental Investigation on A Thermoacoustic Engine with Tapered Resonance Tube A symmetrical standing-wave thermoacoustic engine with tapered resonance tube has been numerically simulated with liner thermoacoustics. The simulation shows that using tapered resonance tube in thermoacoustic engine could decrease the velocity amplitude and lower the total acoustic power loss in the resonance tube. The experimental results indicate that the harmonic was suppressed effectively by using the tapered resonance tube, and the pressure ratio was improved.

采用锥形谐振管的热声发动机的数值模拟和实验研究利用线性热声理论，对一台采用锥形谐振管的驻波型热声发动机进行了数值模拟，发现采用锥形谐振管可有效降低工质气体的速度振幅，进而减小在谐振管中声功率的损失；与一台在相同频率下工作的采用等直径圆柱谐振管的驻波型热声发动机进行了实验对比，结果表明，在使用锥形管作为谐振管的热声发动机系统中，谐振管中的非线性效应得到了明显的抑制，热声发动机在基频模式下稳定运行，压比增大而加热温度降低。

Fruit a schizocarp, disk-shaped, fruit axis as long as or shorter than carpels; mericarps more than 15, laterally compressed and circular with a prominent ventral notch, glabrous or pubescent, 2-celled, proximal cell 1-seeded, distal cell sterile.

果一分果，盘形，果轴等长于或短于心皮；分果爿多于15，侧面压扁和圆形的有一突出腹槽口，无毛或被短柔毛，2室，下部室具1种子，上部室不育。

Tourmaline that has spontaneous polarizability, pyroelectricity and piezoelectricity can beused in many areas, for instance, electromagnetic shield, air purification, etc, therefore, differentspecies of tourmaline, Dravite occurring in pegmatites from Hebei that are different ingranularity and Schorl from Xinjiang that are different at heattreatment temperature and undercondition are tested accurately and studied in this thesis.

电气石具有自发电极性、热释电性和压电性，可应用于多个方面，如电磁屏蔽、空气净化等，为此，本文精确测试和研究了不同种属、不同粒径以及不同温度和条件下热处理电气石粉体的Zeta电位。

Sievert's law is used for hydrogen permeation and modified Soave-Redlish-Kwang equation of state is adopted to calculate the fugacity coefficients for methanol and water to account for the non-ideality at high pressure.

Sievert's定律用来解释氢气的渗透，而采用Soave-Redlish-Kwang状态方程式去估计甲醇与水在高压下之非理想状态之逸压系数。

Under the condition of axial compression, simple bending and compression-bending, the effects of parameters to CFTs mechanical performance are studied. The parameters taken in account are concrete compression strength, steel ratio, steel strength.

在轴压、纯弯和压弯情况下分析钢管混凝土柱力学性能受混凝土强度、含钢率和钢材屈服强度等参数的影响规律及其破坏机理。

They propel him across the room and slam him against an old four-pocket machine, bending him over it.

他们推搡着安迪把他猛得按在一台有着four-pocket的旧机器上，压着他弯下腰去。

They propel him across the room and slam him against an old four-pock et machine, bending him over it.

他们推搡着安迪把他猛得按在一台有着 four-pocket 的旧机器上，压着他弯下腰去。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。