Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES)
What is the base (fundamental) frequency is a pipe gives notes of frequencies 255, 425 and 595 and decide whether it is closed at one end or open at both ends.
A. |
17, closed |
B. |
85, closed |
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C. |
17, open |
D. |
85, open |