选词填空。 盼望 指望 愿望 希望 1．乌塔告诉我，她（ ）到中国去旅游，这是她多年

_____ wonderful news report he wrote! All of us were satisfied with what he did.[ ]

A. What a        

B. What        

C. How        

D. How a

细绳拴一个质量为m的小球，小球将左端固定在墙上的轻弹簧压缩（小球与弹簧不连接），小球静止时弹簧在水平位置，如图所示。将细绳烧断后，下列说法中正确的是( )

A．小球立即开始做自由落体运动

B．小球离开弹簧后做平抛运动

C．小球运动的加速度先比重力加速度小，后来和重力加速度相等

D．小球离开弹簧后做匀变速运动

 A glue that holds the whole Internet together is the network layer protocol, (71)．Unlike most older network layer protocols, it was designed from the beginning with internetworking in mind．Its job is to provide a (72) way to transport datagrams from source to destination，without regard to whether these machines are on the same network or whether there are other networks in between them． Communication in the Internet works as follows．The (73) layer takes data streams and breaks them up into datagrams．Each datagram is transmitted through the Internet, possibly being fragmented into smaller units as it goes．When all the pieces finally get to the destination machine, they are reassembled by the (74) layer into the original datagram．This datagram is then handed to the transport layer, which inserts it into the receiving process’ input stream． An IP datagram consists of a header part and a text part．The header has a (75) part and a variable length optional part．

空白处（75）应选择（）

A.40-byte fixed

B.64-byte fixed

C.20~64 bytes variable

D.20-byte fixed

客运类船上不得装载（）。

A．爆炸品

B．危险货物

C．具有特殊危险的货物

D．易流态化货物

车载GPS系统定位精度是（）。

A、10M

B、50M

C、100M

D、优于1M