What has made working at home possible
A. Personal computers.
B. Communication industry. C. Modem office design.
从挥发油乙醚液中分离得到下列成分,应加入:酸性成分()
A. Na,SO3
B. 1%HCl或H2SO4
C. Girard T或P
D. 丙二酸单酰氯
E. 2%NaOH
What are the speakers going to do this weekend
A. Go to the beach.
B. Climb a mountain.
C. Go for a bicycle-ride.
What is the woman good at
A. Swimming.
B. Running.
C. Playing.