【简答题】Please examine the handbook for the 74th UN GA sessions and explain which of the session you would like to attend if you were a delegate for international trade from China.
【单选题】Which of the following does a teacher want his/her students to develop if he/she guides them to take notes using key words, abbreviations and symbols?
【单选题】Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed? (1) gear; (2) centrifugal; (3) screw.