The hinge fitting used to attach the boom to the mast is the（）. gooseneck。 step。 swivel。 pintle。
The heaviest type pallet is the（）. factory pallet。 shipping pallet。 stevedoring pallet。 warehouse pallet。
The head of the bend is the（）. top or upstream beginning of a bend。 bottom or downstream beginning of a bend。 midpoint or center radius of a bend。 center line or apex of a bend。
The firing of a red star signal may mean（）. This is the best place to land。 You are seen - assistance will be given as soon as possible。 Tail block is made fast。 Slack away。
The Coordinator Surface Search in a SAR situation should display by day（）. the code flags FR。 a black ball over a black diamond shape。 code flag Quebec over a black ball。 two black diamond shapes in a vertical line。
在极限承载力状态下，桩顶荷载由桩侧及桩尖共同承受的桩是（）。
