试述调节阀的检修过程？
参考答案：
做记号；解体；清洗；零部件修理；组装；调试；试漏试压；联动调试；开车保运；
. When the teacher came in, the student pretended ________ his lessons.
A．to do
B．to have done
C．to be doing
D．to be done
I am _______ that he has not answered my letter.
A．bothered
B．interrupted
C．interfered
D．annoyed
