企业确认收入与费用时应遵循 ( )
A. 重要性原则
B. 可比性原则
C. 谨慎性原则
D. 实质重于形式原则
Falling sales and rising overheads have obliged the company to review each customer's（）limit.
A. credit
B. currency
C. check
D. certificate
On the end of his nose was a () of thick glasses.
A. pair
B. set
C. couple
D. suit
慢性肺源性心脏病急性期呼吸衰竭的给氧原则是
A. 持续高浓度给氧
B. 持续低浓度给氧
C. 不需给氧
D. 间断高浓度给氧
E. 间断低浓度给氧
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