單項(xiàng)選擇題The locking pin that joins the parts of a detachable link is held in position by（）.

A.a tack weld
B.the self-locking characteristics of its taper
C.a cotter pin
D.a lead plug


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1.單項(xiàng)選擇題The lifeline of a life float or buoyant apparatusshall（）.

A.be at least 3/8 inch diameter and properly secured around the sides and ends of the device
B.be festooned in bights not longer than three feet long
C.have a seine float in each bight unless the line is an inherently buoyant material
D.All of the above

2.單項(xiàng)選擇題The lay of a line refers to（）.

A.its normal location of stowage
B.the direction of twist in the strands
C.the manner in which it is coiled
D.the manner in which it is rigged

3.單項(xiàng)選擇題The grooved wheel inside a block is called a（）.

A.cheek
B.gypsy
C.sheave
D.drum

4.單項(xiàng)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

5.單項(xiàng)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