乳化液泵蓄能器常用充气方法有几种（）。
A、3
B、4
C、5
D、2
参考答案：A
____ usually convenient to take the underground train to most places. [ ]
A. You are
B. It is
C. He is
D. She is
加烈酒的酒精浓度是多少？
