决定干纸强度的主要因素是什么？
参考答案：纸的干度高于55%之后纤维之间逐步形成氢键结合，所以干纸强度主要依靠纤维之间的氢键结合。
关于人体内的血浆、组织液和淋巴三者之间的物质联系的表达，正确的是[ ]
A．
B．
C．
D．
For GMDSS，when may a compulsory vessel not be allowed to leave port?（）
A.When the vessel is in an overloaded condition
B.When the vessel has arranged for both duplication of equipment AND shore-based maintenance
C.When the vessel has replaced a required piece of GMDSS-related equipment but its performance has not been verified or logged
D.When the vessel is carrying only two licensed GMDSS Radio Operators and is capable of performing all required functions
