【单选题】在网络202.115.144.0/20中可分配的主机地址数是( )。
【单选题】14 Questions 13 to 15 are based on the passage you have just heard.
A.
When two commercial airplanes crashed within months.
B.
When the speed of commercial airplanes greatly increased.
C.
When investigators found the weakness of rectangular windows.
D.
When commercial airlines began to develop faster
【单选题】14 Questions 12 to 15 are based on the conversation you have just heard.
A.
He thinks it is exciting and challenging.
B.
He thinks it contributes a lot to society.
C.
He thinks it is well-paid.
D.
He thinks it is quite easy.
【单选题】14 Questions 12 to 15 are based on the conversation you have just heard.
A.
Reschedule her timetable.
B.
Go on to the university website.
C.
Visit the registration office.
D.
Ask the professor for help.
【简答题】值班运行工的常用工具有()和低压试电笔等。
【单选题】根据遗忘的时间长短,可以将以往分为( )。