在四冲程汽油机的一个工作循环中,对外做功的是[ ]
A、吸气冲程
B、压缩冲程
C、做功冲程
D、排气冲程
答案:C
用句中黑体字的正确形式填空。
1.Honestly, I've been doubting his ________.
2.Nowadays, competition exists everywhere. It's no easy for a business to take the lead
in the ________ world markets.
3.Besides physical fitness, all the parents hope their children will develop properly
mentally as well as ________.
4.All his relatives ________ to the crime have been brought to the police station.
5.We have put an advertisement in the newspaper,________ for college graduates with
computer skills.
右下图所示为世界某国局部示意图,据图回答下列各题。
小题1:图示地区北部地势特点是 ( )
A.西高东低
B.中间低四周高
C.东南高西北低
D.北高南低小题2:该国以葡萄美酒著名,大范围种植葡萄的地点在 ( )
A.①地
B.②地
C.③地
D.④地小题3:影响城市②形成与发展的主要因素不包括 ( )
A.位于河流附近,航运便利
B.地形平坦,农业发达
C.气候温和湿润,水资源丰富
D.矿物能源丰富,工业发达