下列中哪项不宜施行甲状腺大部切除术()。
A.中度原发性甲亢并发心律不齐
B.甲亢有气管压迫症状
C.青少年甲亢
D.继发性甲亢
E.妊娠早期甲亢
参考答案:C
A vessel aground may have negative GM since the().
A.decrease in KM is equal to the loss of draft
B.virtual rise of G is directly proportional to the remaining draft
C.lost buoyancy method is used to calculate KM, and KB is reduced
D.displa ement lost acts at the point where the ship is aground
企业采购工作的第一步是()。
A.采购申请
B.市场调查
C.需求预测
D.供应商调查