1. [单选题]What is the minimum requirement of a GMDSS operator?
A. GMDSS operator license
B. Third officer license
C. General Radiotelephone Operator license and Radar Endorsement
D. General Radiotelephone license or First or Second Class Radiotelegraph license with GMDSS Radio Officer’s endorsement
2. [单选题]活塞环环槽中的运动形态是由( )决定的。
A. 气体力
B. 惯性力
C. 摩擦力
D. 以上三者均是
3. [单选题]We’ll finish loading the trucks soon. Please get ready for ________
A. lashing
B. discharging
C. loading
D. tightening
