目前所有船舶的主配电板都装有并车屏。
参考答案：错
解析：可以将并车屏功能分置于发电机屏或一个小箱内，故并不是所有的船舶主配电板都装有并车屏。
冰点降低
A chart projection depicting the poles and a small area on either side of a connecting meridian，that is sometimes used for star charts，is the（）.
A.azimuthal gnomonic projection
B.Lambert conformal projection
C.transverse Mercator projection
D.polyconic projection
