尤因肉瘤主要来源是A．成骨细胞 B．成纤维细胞 C．成软骨细胞 D．间充质细胞 E．

在水中，氢元素和氧元素间的质量比是

A．1:1

B．2:1

C．1:8

D．8:1

下列强腐蚀性，剧毒物保管不妥的是（）。

A.容器必须密封好放于专门的柜子锁好

B.强酸强碱要分开存放

C.氢氟酸应用陶瓷罐密封保存

D.浓H2SO4不要与水接触

对体型肥胖患者，检查糖耐量异常，应选用（）

A.格列本脲

B.消渴丸

C.饮食疗法

D.格列喹酮

E.格列齐特

屋面工程维修养护的中心内容是( )。

A．防水层的养护

B．二次装修的管理

C．杜绝不合理荷载

D．避免虫害

You are proceeding to a distress site and expect large numbers of people in the water. Which statement is TRUE?（）

A.You should stop to windward of the survivors in the water and only use the ship's boats to recover the survivors

B.If the survivors are in inflatable rafts you should approach from windward to create a lee for the survivors

C.An inflatable liferaft secured alongside can be an effective boarding station for transfer of survivors from the boats

D.Survivors in the water should never be permitted alongside due to the possibility of injury from the vessel