分析下面的JavaScript语句:str=“This app costs”+5+0.5;执行后str的结果是_。(2.0) A: “This apple costs”5.5 B: This apple costs50.5 C: “This apple costs”50.5 D: This apple costs5.5

要生成一个20.5和50.5之间的随机浮点数，应该使用random库的哪个函数 A: random.random(20.5, 50.5) B: random.uniform(20.5, 50.5) C: random.randrange(20.5, 50.5) D: random.randfloat(20.5, 50.5)

Which of the following are costs incurred by people trying to protect themselves from the effects of inflation?? menu costs but not shoeleather costs|shoeleather costs but not menu costs|menu costs and shoeleather costs|menu costs but not shoeleather costs

Costs that change with the level of production are referred to as ________. A: fixed costs B: variable costs C: target costs D: total costs

Which of the following costs are always irrelevant in decision making? A: avoidable costs B: sunk costs C: opportunity costs D: fixed costs

Which two basic costs are considered in the basic EOQ model?() A: Inventory carrying costs B: interest costs C: order costs D: obsolescence costs

分析下面的JavaScript语句：str="Thisapplecosts"+50.5；执行后str的结果是（） A: Thisapplecosts50.5 B: Thisapplecosts5.5 C: "Thisapplecosts"50.5 D: "Thisapplecosts"5.5

Variable costs are costs that change with the level of production.

David has $5 but this pen is $2 more than that. A: The pen costs $2. B: The pen costs $5. C: The pen costs $3. D: The pen costs $7.

Shipping costs in America is cheaper than shipping costs in China.