某船吃水5.48m时排水量Δ=6729t，TPC=11.4t/cm，从ρ=1.004

如图所示，某物体做直线运动的v-t图象，由图象可知，下列说法中正确的是（　　）

A．物体在0～10s内做匀速直线运动

B．物体在0～10s内做匀减速直线运动

C．物体运动的初速度为10m/s

D．物体在0～10s内的加速度为2.5m/s²

球-管平衡

关于油包水乳化钻井液，下列说法正确的是（）。

A、受水泥的影响

B、容纳钻屑能力差

C、润滑性差

D、不受碳酸盐、硫化氢的影响

Originally introduced by Netscape Communications, (71) are a general mechanism which HTTP Server side applications, such as CGI (72) , can use to both store and retrieve information on the HTTP (73) side of the connection. Basically, Cookies can be used to compensate for the (74) nature of HTTP. The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based (75)

A．graphics

B．processes

C．scripts

D．texts

简述法医物证检材的防止污染原则。