In a small construction firm, another crew supervisor is added for every 10 workers employed. This is an example of a: A: a. purely variable cost B: b. discretionary fixed cost C: c. step cost D: d. mixed cost

请写出与 10 < cost < 50 等价的表达式:

It cost me one pound, p______ 10 pence to have the letter posted.

已知二端网络的关联的端口电压和端口电流分别为u(t)=10cost(v),i(t)=5cos(t+60°) (A), 则二端网络吸收的平均功率为( )W。 A: 5 B: 10 C: 12.5 D: 15

The tickets each ______ 10 dollars. A: cost B: costs C: is costing D: are costing

Fixed Cost，Veriable Cost，Explicit Cost，Implicit Cost，Opportunity Cost，Sunk Cost，Economic Profit，Normal Profit，Average Cost，Margial Cost

在STP的路径开销中，10 Mbps链路的开销Cost值为100；100 Mbps链路的Cost值为____；1000 Mbps链路的Cost值为____ 。

This book______me twenty dollars. A: is cost B: was cost C: cost D: have been cost

Berhman saved Johnsy _____ his own life. A: at any cost B: at no cost C: at the cost of D: in the cost of

What type of cost is the supervisor salary cost, when one supervisor is needed for every ten employees added to the staff A: A fixed cost B: A variable cost C: A mixed cost D: A step cost