If the length of a wire is halved and the cross-sectional area is doubled, the resistance will be ()
A、quartered
B、unchanged
C、doubled
D、quadrupled
A、quartered
B、unchanged
C、doubled
D、quadrupled
A、one and one-half times the length of a dot B、twice the length of a dot C、three times the length of a dot D、four times the length of a dot
A、the length between perpendiculars B、the registered length C、the length overall D、the length of waterplane on summer draft
A、length of the crankshaft B、volume of the clearance space C、weight of piston D、length of the stroke
A、right at the bow B、one-third the length of the vessel from the bow C、one-half the length of the vessel from the bow D、two-thirds the length of the vessel from the bow
A、shorter than the rowing oars B、the same length as the rowing oars C、longer than the rowing oars D、unrelated to the length of the rowing oars
A、A.excessive strain is placed on the shorter leg B、B.the shorter leg may fail C、C.the longer leg is slack D、D.All of the above
A、A.right at the bow B、B.one-third the length of the vessel from the bow C、C.one-half the length of the vessel from the bow D、D.two-thirds the length of the vessel from the bow
A、of the wave's crest B、of the wave's trough C、measured from crest to trough D、measured from crest to crest
A、about one-quarter of the vessel's length from the stern B、at the bow C、about one-third of the vessel's length from the bow D、aft of the propellers