单项选择题

In the operation of transferring solution with a pipet, stop for 15s after the solution flows out naturally, and then remove it.
A、正确
B、错误

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In the operation of transferring solution with a pipet, stop for 15s after the solution flows out naturally, and then remove it. A、正确 B、错误

In the operation of transferring solution with a pipet, stop for 15s after the solution flows out naturally, and then remove it.
A、正确
B、错误