Acoustics-Determination of sound power levels of noise sources using sound pressure-Survey method using an enveloping measurement surface over a reflecting plane

声学声压法测定噪声源的声功率级采用包络测面积的简易法

属类：行业标准名称-国际标准-EN ISO 3746-1995

Acoustics--Determination of sound power levels of noise sources using sound pressure--Survey method using an enveloping measurement surface over a reflecting plane

声学声压法测定噪声源声功率级反射面上方采用包络测量表面的简易法

属类：行业标准名称-国家标准名-GB/T3768-1996

A membranous vascular organ that develops in female mammals during pregnancy,lining the uterine wall and partially enveloping the fetus,to which it is attached by the umbilical cord.Following birth,the placenta is expelled.

胎盘雌性哺乳动物在怀孕期间生长的薄膜血管器官，靠着子宫壁且包住由脐带束住的胎儿。随着胎儿出生，胎盘去除

属类：综合句库--

An enveloping sheath or envelope.

外皮或包膜一个包装壳或外壳

属类：综合句库--

RECIPROCATING INTERNAL COMBUSTION ENGINE DRIVEN CURRENT GENERATING SETS. PART 10 : MEASUREMENT OF AIRBONE NOISE BY THE ENVELOPING SURFACE METHOD.

往复式内燃机驱动的交流发电机组.第10部分:包络面法测量空气噪声

属类：行业标准名称-国际标准-NF E37-310-1999

Reciprocating internal combustion engine driven alternating current generating sets-Measurement of airborne noise by the enveloping surface method

往复式内燃机驱动交流发电机组.用外壳表面法对气载噪音的测定

属类：行业标准名称-国际标准-BS 7698-10-1999

Reciprocating internal combustion engine driven alternating current generating sets-Part 10: Measurement of airborne noise by the enveloping surface method

往复式内燃交流发电机组 第10部分:包络面法测量空气噪声

属类：行业标准名称-ISO标准-

The rim of the plugs is usually not exposed and the enveloping material cannot be ascertained

岩栓的边缘通常是不露出的，因而不能确定其包裹的物质是什么。

属类：综合句库--

Blocking the open-sided porch, framed by the enveloping fog, stood a tall grave-faced policeman.

一位身材高大的警察，板着面孔，堵住了敞开的门廊，像被套在镜柜里似地站在氤氲大雾之中。

属类：综合句库-英汉翻译-

Accuracy of double enveloping worm gearing with straight line generatrix

直廓环面蜗杆、蜗轮精度

属类：行业标准名称-国家标准名-GB/T16848-1997