粘度
参考答案：
是流体流动过程中，内部相邻各层间发生相对运动时内摩擦力大小的量度。
It was reported that the passenger ship was sailing eastwards in the Atlantic Ocean ____ its captain
and some passengers on board____ something supposed to be a UFO flying overhead. [ ]
A. while; caught sight of
B. when; caught sight of
C. as; saw
D. since; caught a sight of
金融工程通过设计融资方案可以达到传统金融工具难以满足的特定融资需要，降低融资成本。( )
