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【简答题】
珠江上的清洁工人发现江面漂浮一木块，露出水面约0.001m 3 ，打捞上船后发现木块体积约为0.004m 3 ．（已知：ρ 水 =1.0×10 3 kg/m 3 ；g取10N/kg）求： （1）木块浸在水中的体积？ （2）所受的浮力约是多少？ （3）木块的质量是多少？ （4）木块的密度约是多少？
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头高足低位
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【单选题】_____ is a written record to be kept for future reference.
A.
A summary
B.
An agenda
C.
A recorder
D.
A minute
查看完整题目与答案
【单选题】The Garbage Record Book, as a part of the ship’s official logbook, shall be kept on board and preserved for a period of .
A.
3 years after making the first entry
B.
2 years after the last entry
C.
3 months after last entry
D.
3 years after the last entry
查看完整题目与答案