The term PROLONGED BLAST refers to（）.<br>A:a blast of from five to seven seconds' duration<br>B:a blast of from five to six seconds' duration<br>C:a blast of from four to six seconds' duration<br>D:a blast of from six to seven seconds' duration

The term PROLONGED BLAST refers to（）.
A:a blast of from five to seven seconds' duration
B:a blast of from five to six seconds' duration
C:a blast of from four to six seconds' duration
D:a blast of from six to seven seconds' duration

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