航海英語(yǔ)貨物裝卸貨作業(yè)單項(xiàng)選擇題每日一練(2019.01.15)

來源：考試資料網(wǎng)

1 Which operation may cause the pressure in an inert tank to fall below the prescribed limits（）.

2 When（）clean ballast water from any vessel，an application shall be made to Harbor Authorities for approval.

3 Which of the following statement（s）is/are TRUE regarding a twin pedestal crane set（）.

4 The net productivity per gang-hour can be improved through a decrease of（）.

5 The item（）is not the advantage of the hydraulic winch．