單項選擇題The cheek length of a block in inches should be about（）.
A.three times the circumference of a manila line
B.five times the diameter of a manila line
C.twice the diameter of its sheaves for manila line
D.twenty times the diameter of a manila line
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1.單項選擇題The 12-foot low-velocity fog applicator（）.
A.has a spray pattern 12 feet in diameter
B.can be used in conjunction with both 1-1/2 inch and 2-1/2 inch all-purpose nozzles
C.has a 90°bend at its discharge end
D.has a screw thread end which connects to the all-purpose nozzle
2.單項選擇題Splices made in nylon should（）.
A.be long splices only
B.have extra tucks taken
C.be short splices only
D.be around a thimble
3.單項選擇題Right-laid line should be coiled（）.
A.clockwise
B.counterclockwise
C.either clockwise or counterclockwise
D.on a reel
4.單項選擇題On small sailing vessels，the PRIMARY reason for using nylon in a combination chain-nylon anchor line is to（）.
A.provide elasticity
B.increase the strength
C.reduce the cost
D.reduce the weight
5.單項選擇題It’s no good（）down by head．
A.to sail
B.sails
C.sailing
D.sailed