脉冲波多普勒超声最适用于检测

脉冲反射式超声波探伤仪同步脉冲的重复频率决定着：（）

超声波美容仪的脉冲波输出，超声射束有规律地（），每个脉冲持续时间很短。

超声波脉冲反射式（）是超声波检验设备的全称。

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

采用超声回弹综合法检测混凝土强度时，应先进行超声检测，后进行回弹检测。

发射电路是产生高频振荡脉冲，用于激励探头晶片产生超声脉冲。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。