單項選擇題What does the abbreviation SWL stand for?().

A.Signal wave letters
B.Ship without light
C.Safe water line
D.Safe working load


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1.單項選擇題What time can I()the canal?

A.enter
B.enter in
C.enter to
D.enter into

2.單項選擇題What’s wrong()the winch?

A.for
B.with
C.to
D.on

3.單項選擇題When out of sight of land, a ship’s position can be found by using().

A.the coastal navigation
B.the celestial navigation
C.traditional navigation
D.the great circle navigation

4.單項選擇題When visibility is reduced to about 5 miles, we say that visibility is().

A.very good
B.good
C.poor
D.moderate