单项选择题
A. The technician should always bend at the waist and lift with their arms.
B. The technician should seek assistance from an available customer.
C. The technician should always bend at the waist and lift with their back.
D. The technician should get assistance from another technician.
单项选择题 A laser printer has an error tray two paper jam but tray two does not have any paper in it. Which of the following should the technician do FIRST? （）
单项选择题 Which of the following is the MOST secure method to authenticate users?（）
单项选择题 A frustrated customer has called about their computer that is not functioning correctly. Which of the following is the BEST question to ask the user?（）