【单选题】The writer advises those who hesitate to sell their stocks for money to
A.
sell unless the market goes up.
B.
buy more stocks during a bull market.
C.
wait for the long haul.
D.
sell out as soon as possible.
【单选题】The writer advises us to do the following to prepare for a fire except that ________.
A.
we practice for a fire
C.
we buy fire extinguishers
D.
we use electrical cookers
【判断题】活门室是缓冲气体流速,起保护活门的作用,它能使吸气、排气平稳,使气体平衡均匀余隙控制气缸余隙容积为3%~8%,气缸余隙通常为5%~12%
【单选题】双作用活塞式压缩机余隙的确定应该是( )。
【单选题】双作用活塞式压缩机余隙的确定应该是( )