If the resistance of a circuit is cut

1、The function of the cut-off lever is（）

The function of the cut-off lever is（）Ato provide electrical signalBto provide feed-backCto provide local manual controlDto provide right rudder angle

2、The resistance of a conductor varies （

The resistance of a conductor varies （）Adirectly as its length and inversely as its cross-sectional areaBinversely as its length and directly ...

3、If the dispersion of a given fiber is

If the dispersion of a given fiber is 17ps/nm*km at 1550 nm and zero at 1310 nm, then what is the accumulated dispersion of an ITU wavelength after it travels 200 km?（）A0 ps/nmB340 ps/nmC200 ps/nmD3400 ps/nmEMore information is needed.

4、The purpose of a custom is to cut down

The purpose of a custom is to cut down imports in order to protect domestic industry and workers from foreign competition.AtaxBtollCfeeDtariff

5、If the result of loading a vessel is a

If the result of loading a vessel is an increase in the height of the center of gravity,there will always be an increase in the（）.Ametacentric heightBrighting armCrighting momentDvertical moment

6、If the length of a wire is halved and

If the length of a wire is halved and the cross-sectional area is doubled, the resistance will be （）AquarteredBunchangedCdoubledDquadrupled