Rick is a good man．He makes birthday cakes in a shop．His cakes are great and have very good prices，so many people buy his cakes．He makes friends with lots of his customers(顾客)．They all like him very much．One evening．he wants to go home，but many of his old customers come in．Rick smiles(微笑)to them，“I am sorry．It is late today．If you need cakes，please come tomorrow．”One of them takes out a nice cake and says to him，“You make so many great cakes for us．This birthday cake is for you．Happy birthday, Rick．”

小题1:Where does Rick work?  ________．

A．At school．

B．In the classroom．

C．In a shop．

D．At a party．小题2:When the customers come one evening，Rick _______．

A．is making cakes

B．is at home

C．wants to go home

D．is playing basketball小题3:His customers give him________．

A．many cakes

B．a birthday cake

C．some money

D．some fruit小题4:Rick’s customers like him because_________．

A．he’s a good man

B．his cakes are big

C．his cakes are at a very good price

D．A and C小题5:One evening, the customers come to Rick’s shop because________．

A．they want to buy cakes

B．it is Rick’s birthday that day

C．Rick asks them to come

D．they come for a party

某车间380V/220V电力线路上，接有4台220V单相加热器，其中10kW 2台接在A相、 30kW 1台接在B相、20kW 1台接在C相。此外，有4台380V电焊机，其中14kW (ε=100%)2
台接在AB相，1台20kW(ε=100%)接在BC相，1台30kW(ε=60%)接在CA相。确定车间的计算负荷P_js。(各类设备K_x、cosα参见20题)