机车牵引重量为机车自重的()倍之间。
A.1-3
B.3-5
C.5-7
参考答案:B
热带雨林气候的特点是 [ ]
A、终年炎热多雨
B、终年低温少雨
C、夏季高温少雨冬季温和多雨
D、夏季高温多雨冬季寒冷干燥
The teacher was satisfied __the progress he had made,because he rid himself ___ being lazy and careless.
A.about;of
B.with;from
C.with;of
D.at;off