单项选择题
A.at all times B.in the bottom return mode C.in the volume reverberation mode D.only when there is no current
A disadvantage of using chain lashing on heavy vehicles...
单项选择题A disadvantage of using chain lashing on heavy vehicles aboard Ro-Ro vessels is that it is （）.
A.heavy B.easily damaged C.affected by temperature D.costly relative to the strength ratio
A device fitted over the discharge opening on a relief ...
单项选择题A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a flame（）.
A.stopper B.screen C.filter D.restrictor
A decrease in barometric pressure is associated with al...
单项选择题A decrease in barometric pressure is associated with all of the following except（）.
A.rising warm air B.proximity to a low pressure area C.inward spiraling circulation D.clear dry weather
