起吊钢板时,只要电磁铁起重能力足够,吸着面或板间允许有异物或间隙。()
A、正确
B、错误
参考答案:B
If market interest rates rise, the price of a callable bond, compared to an otherwise identical option-free bond, will most likely decrease by:()
A. less than the option-free bond.
B. more than the option-free bond.
C. the same amount as the option-free bond.
马斯洛(Maslow)认为,人有五种基本需要,其中由底层而上的第二层是?()
A.社会需要
B.安全需要
C.生理需要
D.自我实现需要