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【单选题】
一警车以25 m·s-1 的速度在静止的空气中行驶,假设车上警笛的频率为800 Hz.静止站在路边的人听到警车驶近时的警笛声波频率为A.
825Hz
B.
743.7Hz
C.
865.6Hz
D.
800 Hz
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反馈参考答案：
举一反三
【判断题】If the shipment date is “on or about May 20” , then the goods must be shippedbefore that date.
A.
正确
B.
错误
【单选题】If the shipment date is "first half of August" in the L/C,then the goods must be shipped( ).
A.
before August 15th
B.
after August 15th
C.
August 1st to 15th,all dates inclusive
D.
August 1st to 15th,exchding August 1st
【判断题】If the shipment date is “on or about May 20”, then the goods must be shipped before that date.（ ）
A.
正确
B.
错误
【判断题】If the shipment date is “on or about May 20”, then the goods must be shipped before that date.
A.
正确
B.
错误
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