单选题The term PROLONGED BLAST refers to（）.Aa blast of from five to seven seconds' durationBa blast of from five to six seconds' durationCa blast of from four to six seconds' durationDa blast of from six to seven seconds' duration
单选题
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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