1/59,3/70,5/92,7/136,( )
A.9/272
B.1/224
C.9/224
D.11/224
参考答案:C
Though I’ve tried very hard to improve my English, by no means ___________with my progress.
A.the teacher is not satisfied
B.is the teacher not satisfied
C.the teacher is satisfied
D.is the teacher satisfied
为便于管理与维修,车间压缩空气管路应以沿墙或柱子架空敷设为主,架空敷设高度以不妨碍交通为原则,但一般不小于(),并尽量减少对采光的影响。
A.2.5m
B.3.5m
C.4.5m
D.5.5m