以下不属于企业产品库存的是（）。 A.产品人库后发现有质量问题，但未办理退库手续的产

一个三角形的面积是20平方厘米，它的高是8厘米，底是______厘米．

冬季钢筋的闪光对焊宜在室内进行，焊接时的环境气温不宜低于0℃，在困难条件下，对以承受静力荷载为主的钢筋，闪光对焊的环境气温可适当降低，最低不应低于（）℃。

A.-10

B.-5

C.5

What are the conditions，under GMDSS，whereby a ship is NOT allowed to depart from any port? （）

A.The vessel is not capable of performing all required distress and safety functions

B.The vessel is carrying more than the required number of qualified GMDSS radio operators

C.The vessel has a temporary waiver of its radio license and Safety Certificate

D.The vessel is not carrying a GMDSS radio maintainer，but has provided for shoreside maintenance plus duplication of equipment if required

试述顾拜旦在复兴奥林匹克运动的贡献？

在河谷比较开阔，泥石流沟距大河较远时，路线可以考虑走堆积扇的外缘。