单项选择题
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
The grooved wheel inside a block is called a（）.A.cheekB...
单项选择题The grooved wheel inside a block is called a（）.
A.cheek B.gypsy C.sheave D.drum
The cheek length of a block in inches should be about（）...
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
The 12-foot low-velocity fog applicator（）.A.has a spray...
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
