计算(ab)2的结果是( )
A.a2b2
B.a2b
C.ab2
D.ab
原式=a2b2.
故选A.
A vessel restricted by its ability to manoeuver by the nature of its work or its deep draft is().
A.hampered vessel
B.giving way vessel
C.vessel not under control
D.disabled vessel
中国南极第四个考察站——泰山站于2014年1月建立。读“我国南极考察站分布图”,结合所学知识分析可知()
A.中山站常年吹东北风
B.昆仑站气压最高
C.泰山站光照时间最长
D.长城站降雪量最大