当空气中氧含量降低到()时,人就会因缺氧晕倒直至死亡。
A. 16%
B. 10%
C. 18%
A lifeboat is weight tested by lowering to near the waterand loading to capacity with weight evenly distributed. Itis then lowered into the water and released. This test mustbe done at least once every().
A. 6 months
B. 12 months
C. 18 months
D. 24 month
汇票在提示时,遭遇付款人拒绝付款或承兑,或者付款人拒不见票、死亡、宣告破产,致使付款(承兑)成不可能,通称拒付,又称退票。
A. 正确
B. 错误
救生圈能经受从存放位置至最轻载航行水线的高度或30m处(取最大者),投落水面而不会损坏救生圈和附件的使用性能。()
A. 正确
B. 错误