1.
celestial 21 cm-hydrogen line
中性氢21厘米谱线
2.
DETERMINATION OF THE GALACTIC ROTATION PARAMETERS FROM CEPHEIDS AND 21CM EMISSION OF NEUTRAL HYDROGEN
用造父变星和21厘米氢线发射探求银河系自转参数
3.
..calculate the number of atoms in a cubic centimeter of hydrogen.
计算一立方厘米氢气中的原子数量。
4.
This depends on the precise radio- frequency of the 21- cm wavelength, or 1420 megacycles per second .
这种方法依靠21厘米波长或每秒1420兆周的精确无线电频率。
5.
ON THE 1157 AND 973 CM~(-1) ABSORPTION BANDS OF POLYPROPYLENE
关于聚丙烯红外光谱中的1157及973厘米~(-1)吸收带
6.
A 21-centimeter photon is much less energetic than the photons typically emitted by hydrogen as electrons jump between orbits.
21厘米光子的能量远比一般氢原子因电子变换轨道而发射的光子来得低。
7.
This depends on the precise radio-frequency of the 21-cm wavelength,
这种通讯联系要靠21厘米波段，
8.
RADIO OBSERVATION OF THE SOLAR ECLIPSE OF SEPTEMBER 22,1968 AT THE WAVELENGTH OF 21 CM
1968年9月22日日食21厘米射电观测
9.
Observation of Continuously Fast Recording of 10ms Solar Macrowave Bursts at 21cm
21厘米太阳爆发10毫秒无间隙快速记录观测
10.
curve of moment to alter trim one centimetre
每厘米纵倾力矩曲线(根据船舶吃水
11.
cm in thickness/a thickness of cm
厚4 厘米[4 厘米的厚度]
12.
The Curative Effect of Narrow-band UVB Combined with Halometasone Cream in Treatment on Palmoplantar Keratodermia Eczema
窄谱中波紫外线联合卤米松乳膏治疗掌跖角化性湿疹疗效观察
13.
The Balance beam stands 120cm high.It is 10cm wide and 500cm long.
平衡木高120厘米,宽10厘米,长500厘米。
14.
Compared with the urban residents, rural males were on average, 4.9 centimeters lower and females are 4.2 centimeters lower.
但与城市相比，农村男性平均低4.9厘米，女性平均低4.2厘米。
15.
In mercaptobenzthiazole the 1500cm-1 band is readily detected in the unconjugated thioketo form.
巯基苯并间硫氮茂的1500厘米－1谱带在非共轭的硫酮型中较易于鉴识。
16.
The number of yams per 10 cm influences the length of the float along with the number of harnesses.
织物中每10厘米中的纱线根数和使用综框的数目影响着浮长线的长度。
17.
Preparation and Spectrum Characteristics of(Y,Gd)_2O_3:Eu~(3+) Nano-particles by Ammonium Bicarbonate Co-precipitation Method
碳酸氢铵共沉淀法制备(Y,Gd)_2O_3:Eu~(3+)纳米材料及光谱特性
18.
A flexible pavement has a wearing surface which is often only 5 cm thick.
柔性路面的磨耗层往往只厚5厘米。