I donate blood to tie the finger when the needle how I feel as if it is not disposable ah, and how do I know that she drew in the end is 300 milliliters or 400 milliliters

Disposables in the blood donation process, see the cost of collection?

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05-2 need to unscrew the small round cap in front of the needle when using it to expose the needle

--The nurse didn't have to save this, she would have been penalized in case of an accident.