Examlex
Opium during the late eighteenth and early nineteenth century was brought into China chiefly by __________.
Urine Sample
A sample of urine collected for medical testing to evaluate and diagnose health conditions.
Refractometer
An optical instrument that measures the refraction, or bending, of light as it passes through a liquid.
Specific Gravity
The ratio of the density of a substance to the density of a reference substance; commonly used in various scientific fields to characterize the physical properties of fluids.
Specimen
A sample of tissue, blood, urine, or other material from the body used for analysis and diagnosis.
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