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问题 多项选择题

提升钢丝绳有（）三项之一时，不论断丝数目多少或绳径是否变化，必须立即更换。

A、断丝三根

B、外层钢丝松动

C、锈蚀严重

D、点蚀麻坑形成沟纹

答案

参考答案：B, C, D

填空题

数据管理技术发展过程经过人工管理、文件系统和数据库系统3个阶段，其中数据独立性最高的是______阶段。
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单项选择题

On November 15, 2008, Grinell Construction Company decided to issue bonds to help finance the acquisition of new construction equipment. They issued bonds totaling $10000000 with a 6% coupon rate due June 15, 2028. Grinell has agreed to pay the entire amount borrowed in one lump sum payment at the maturity date. Grinell is not required to make any principal payments prior to maturity. What type of bond structure has Grinell issued（）

A. Serial bonds.

B. Bullet maturity.

C. Redeemable bonds.
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