妊娠期间出现倦怠、乏力气短、面色苍白、食欲不振称为（）
A.妊娠贫血
B.子满
C.子痫
D.子气
E.子肿
参考答案：A
Deadweight, which is the cargo carrying capacity of a vessel in tons, is determined by（）.
A.loaded displacement minus light displacement
B.gross tonnage minus net tonnage
C.loaded displacement minus net tonnage
D.light displacement minus the weight of the vessel
什么是锅炉化学清洗？
