單項(xiàng)選擇題

A.Safe working load
B.Ship's working lift
C.Starboard wing lift
D.Stress，weight，load

你可能感興趣的試題

A.crow bar
B.device to force a water tight door against the frame
C.heavy steel beam
D.wedge

A.that the fuel valve is open
B.if the air supply system is open
C.if the water sprinkler system is open
D.if the limit switch is on

<blockquote id="orych"><legend id="orych"></legend></blockquote>