【单选题】The Electrolux Trilobite 2.0 robot vacuum cleaner ______.
A.
asks permission before moving from room to room.
B.
uses lasers to help it avoid objects.
【单选题】Which of the following is NOT TRUE according to the passage?
A.
Diners existed before fast-food restaurants.
B.
The menu included more food than sandwiches and coffee.
C.
Burger King is a fast-food restaurant.
D.
Sandwiches became smaller.
【简答题】f___ n. an area where people have never lived before, that not much is known about, esp. in the western US before the 20th century
【判断题】买卖双方按D/P·T/R条件成交时,如日后汇票到期收不回货款,代收行应对卖方负责。 ( )
【判断题】买卖双方按D/P·T/R条件成交时,如日后汇票到期收不回货款,代收行应对卖方负责。( )
【单选题】等成本线是在总成本和生产要素价格既定的条件下,可以购买到的劳动和( )的不同数量组合的轨迹。