单项选择题
A. sounding pipe B. steel pipe C. plastic pipe D. wooden pipe
泥箱（）A. toolboxB. mud boxC. medicine boxD. container box
单项选择题泥箱（）
A. toolbox B. mud box C. medicine box D. container box
污水井盖（）A. bilge well coverB. ballast water coverC. fresh...
单项选择题污水井盖（）
A. bilge well cover B. ballast water cover C. fresh water cover D. sea water well
葫芦吊（）A.derrickB.chainC.chain blockD.bridge
单项选择题葫芦吊（）
A.derrick B.chain C.chain block D.bridge
