正确答案: B

留置权

题目：我国《海商法》规定，被拖方未按照约定支付拖航费和其他合理费用时，承拖方对被拖物有( )，即被拖方如未按约定向承拖方支付其应付的拖航费和延滞费、承拖方为被拖方垫付的款项等，承拖方对处于其占有之下的被拖物可实行留置。

解析：B

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举一反三的答案和解析：

[单选题]对精密仪器火，可选用的灭火机是__________。

二氧化碳灭火机。

[单选题]第二组：Magnetic pickup (MPU) sensors are devices which can be used in conjunction with electronic control modules for monitoring of parameters such as speed, direction of rotation and a variety of alarm conditions. MPU sensors are available in various sizes and types. Following are some guidelines for their selection on industrial engines. MPUs are located near a flywheel, camshaft or other type of gear with rotation relative to engine speed. The passing of the gear teeth through the MPU tip (pole) generates a voltage and frequency. This frequency is converted to a speed reference by a control module. It should be noted here that most MPUs will develop similar signals. However, the magnitude and strength of the signal is dependent on the size of the sensor in relation to the gear teeth, the clearance between the pole piece and the gear teeth, and various other factors. As a general rule of thumb, the following standards should be met:①Dimension of tooth top surface should be equal to or more than the pole piece diameter.

①②③