Test # 35
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1300 questions in 130 tests. Each test contains 10 questions.
Idiom of the Day
let (something) go
to pay no attention to something, to neglect something
The girl is letting her appearance go since she lost her job.
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Precaution while using Microscope
Basic Rules for Caring for Microscopes
EVERYTHING on a microscope is unbelievably expensive, so be careful. Hold a microscope firmly by the stand, only. Never grab it by the eyepiece holder, for example. Hold the plug (not the cable) when unplugging the illuminator. Since bulbs are expensive, and have a limited life, turn the illuminator off when not in use. If used constantly on full power the bulb will overheat and blow (or gently melt the inside of the housing). This is not a good idea! Always make sure the stage and lenses are clean before putting the microscope away. NEVER use anything but good quality lens tissue on any optical surface, with appropriate lens cleaner or distilled water; organic solvents may separate or damage the lens elements or coatings. Cover the instrument with a dust jacket when not in use. Focus smoothly; dont try to speed through the focusing process or force anything. If it isnt working DONT try to fix it unless you really know what you are doing. Make a note of the symptoms and ask someone who knows.