Atwinscrewcraftbeingusedtopickupapersonwhohasfallenoverboardfromavesselshouldapproachifyou（）.
A. reverseportengine,applyrightrudder
B. reverseportengine,rudderamidships
C. reversestarboardengine,applyrightrudder
D. reversstarboardengine,rudderamidships
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Asolutiontoovercometrippingdefectsisanarrangementofspecialplatesoneithersideoftheflukes,designedtosettheminthecorrecttrippingposition.Thesespecialplatesarecalled（）.
A. trippers
B. stocks
C. awl
D. palms
在基于感应环线通信的移动闭塞系统中，感应环线每（）交叉一次。
A. 20m
B. 25m
C. 50m
D. 10m
Aself-containedbreathingapparatusisusedto（）.
A. makeunderwaterrepairstobarges
B. determineiftheairinatankissafeformen
C. enterareasthatmaycontaindangerousfumesorlackoxygen
D. resuacitateanunconsciousperson
Aright-handedpropellerwillcausethesurvivalcraftto（）.
A. walkthesterntostarboardinreverse
B. walkthesterntoportinreverse
C. runfasterthanalefe-handedpropeller
D. rightitselfifcapsized
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