下列关于离心式压缩机的特点的说法,正确的是()。
A、输气量大而连续
B、容易实现自动控制
C、维修工作量大
D、体积较其它类型的压缩机大
参考答案:A, B
Ten years ago the population of our village was ______ that of theirs.
A.as twice large as
B.twice as large as
C.twice as much as
D.as twice much as
病人卒然昏倒,不省人事,四肢厥冷,呼吸自续者为
A.癫病
B.厥证
C.中风脱证
D.痈病