靠泊操纵中,超大型船舶进靠直壁式码头的速度一般应控制在:().
A.5~10cm/s
B.10~15cm/s
C.2~5cm/s
D.20cm/s
参考答案:C
促进并维持人体性功能发育成熟的物质是()
A.血液
B.天癸
C.津液
D.肾气
E.宗气
There are twenty girls in the classroom. Some are cleaning the tables, and __ __ are sweeping the floor. [ ]
A. another
B. the other
C. other
D. the others