- contrast test
- 对比试验
English-Chinese chemistry dictionary (英汉化学大词典). 2013.
English-Chinese chemistry dictionary (英汉化学大词典). 2013.
Contrast-enhanced ultrasound — (CEUS) is the application of ultrasound contrast medium to traditional medical sonography. Ultrasound contrast agents rely on the different ways in which sound waves are reflected from interfaces between substances. This may be the surface of a… … Wikipedia
Contrast-induced nephropathy — Classification and external resources ICD 10 N99.0 ICD 9 586 Co … Wikipedia
Contrast resolution — is the ability to distinguish between differences in intensity in an image.[1] The measure is used in medical imaging to quantify the quality of acquired images. It is a difficult quantity to define, because it depends on the human observer as… … Wikipedia
Contrast sensation — is a human ability to distinguish objects which scarcely stand out against a background. Contrast sensation is evaluated on the basis of sinusoidal grids.Fact|date=November 2007 The increased threshold of contrast sensation may be a symptom of… … Wikipedia
Contrast ratio — The contrast ratio is a property of a display system, defined as the ratio of the luminance of the brightest color (white) to that of the darkest color (black) that the system is capable of producing. A high contrast ratio is a desired aspect of… … Wikipedia
test — 1. To prove; to try a substance; to determine the chemical nature of a substance by means of reagents. 2. A method of examination, as to determine the presence or absence of a definite disease or of some substance in any of the fluids, tissues,… … Medical dictionary
Contrast (statistics) — In statistics, particularly analysis of variance, a contrast is a linear combination of two or more factor level means (averages) whose coefficients add up to zero.[1][2] A simple contrast is the difference between two means. A contrast may be… … Wikipedia
Contrast (linguistics) — In semantics, contrast is a relationship between two discourse segments. Contrast is often overtly marked by markers such as but or however, such as in the following examples: It s raining, but I am not taking an umbrella. We will be giving a… … Wikipedia
Test card — A test card, also known as a test pattern in the UK, North America and Australia, is a television test signal, typically broadcast at times when the transmitter is active but no program is being broadcast (often at startup and closedown). Used… … Wikipedia
Test target — A test target is a common feature on interplanetary landing craft such as the Viking Lander and Mars Exploration Rovers.The target is usually a visible marker or plate on the exterior of the vehicle within sight of the lander s imaging system… … Wikipedia
test pattern — TV Any of various combinations of converging lines, alignment marks, and gray scales appearing on screen to aid in video equipment adjustment for picture alignment, registration, and contrast. Often viewed on broadcast television in off air hours … Audio and video glossary