Identitycard译为()。
A. 证书
B. 地址卡
C. 户口本
D. 身份证
Five years ago Edward decided to leave the North and____a less oppressive life in HouMon.
A. search
B. explore
C. survey
D. seek
The piston cooling system may employ similar components, except that _____ is used instead
A. a sump tank
B. a feed well
C. a double bottom tank
D. a drain tank
在相同条件下,a L氢气和b L氨气所含原子数相同,则a与b之比为()。
A. 1:1
B. 2:1
C. 1:2
D. 1:3