单项选择题

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

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单项选择题

The grooved wheel inside a block is called a（）.

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

单项选择题

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

单项选择题

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