银行信贷经营管理的基本原则主要是指（）。
A.安全性原则
B.效益性原则
C.创新性原则
D.流动性原则
参考答案：A, B, D
A 28-year-old nurse has complaints of itching and a rash of both hands. Contact dermatitis is initially suspected. The diagnosis is confirmed if the rash appears（）
A. erythematous with raised papules.
B. dry and scaly with flaking skin.
C. inflamed with weeping and crusting lesions.
D. excoriated with multiple fissures.
汽车尾气中的CO在四氧化三钴（Co3O4）纳米棒的催化作用下，低温即能与O2反应生成CO2。Co3O4中Co的化合价是（ ）
A．+价
B．+4价
C．+3价
D．+2价
价