(blank) should be heated using a gentle, back and forth motion.
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Ответ:
The word to fill the blank space is:
"Test Tubes"
Complete sentence will be"
Test tubes should be heated using a gentle, back and forth motion.
This is part of the lab safety lessons and it will allow the test tube to be heated evenly. Also when heating a test tube point it always away from yourself and other as well to avoid any unnecessary damage.
Ответ:
option B