有一做匀速直线运动的物体，在0.4s内通过的路程是2m，它的速度是______，

Hardly had we got the project completed before the deadline when I _______ that a group of experts would come to _______ it. But to my disappointment, the so-called experts seemed to be totally amateurs to me.      [ ]

A. was informed of; assess  

B. was informed; inspect  

C. was told; value  

D. became informed; see

在重置抽样时，样本均值的标准差为总体标准差σ的（）。

A.A

B.B

C.C

D.D

下列不属于非贸易结算内容的是（）。

A．国际商品进出口收支

B．旅游外汇收支

C．国际运输收支

D．保险费收支

下列属于肺癌局部扩展症状的是（）

A.呼吸困难

B.咳嗽

C.声音嘶哑

D.喘鸣

E.胸闷

“流涕长潸”的意思是眼泪鼻涕长流不止。