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【多选题】
下列关于射线声学声强基本公式的描述，正确的有( )。A.
当声线水平传播距离与初始掠射角的偏导数为零时，声强基本公式不可用
B.
声强基本公式体现了声线管束变化引起声强的变化
C.
声强基本公式体现了介质声吸收引起声强的变化
D.
声强基本公式体现了海面海底声反射引起声强的变化
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皮皮学刷刷变学霸
举一反三
【单选题】The British Cabinet meets ________ in one of the rooms in the Prime Minister's official residence, No. 10 Downing Street.
A.
regularly
B.
irregularly
C.
twice a week
D.
once a month
【单选题】The members of the British Cabinet meets ________ in No. 10 Downing Street.
A.
regularly
B.
irregularly
C.
twice a week
D.
once a month
【简答题】舒尔曼把教师的知识分为三类: , , 课程知识 .
【单选题】The Cabinet meets ________ in one of the rooms in the Prime Minister's official residence, No. 10 Downing Street.
A.
regularly
B.
irregularly
C.
twice a week
D.
once a month
【单选题】The Cabinet meets ( )in one of the rooms in the Prime Minister's official residence,No.10 Downing Street.
A.
regularly
B.
irregularly
C.
once a month
D.
twice a week
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