下列关于轮胎式起重机的安全使用叙述正确的是（）。 A.回转半径以外10m内不得有障碍

______________ name is Li Lin. ______________ is a boy.[ ]

A. He; His

B. Her; He

C. His; He

下图的各方框表示有关的一种反应物或生成物（某些物质已经略去），其中常温下A、C、D为无色气体，C能使湿润的红色石蕊试纸变蓝,X分解产生A、B、C三种产物的比值为1:1:1。

（1）写出下列各物质的化学式：

X：           ；B：           ；F：           ；G：          。

（2）按要求写出下列变化的反应化学方程式：

A→D的化学反应方程式：                                       ；

G→E的离子反应方程式：                                       。

尤文肉瘤好发部位为（）.

A.股骨

B.胫骨

C.桡骨

D.骶骨

E.尺骨

人体呼出的气体中也含有少量氧气．______．

Even though current technologies make the ultimate segmented network impractical, new technologies and products hold the promise of making the concept a reality. Most important of all these new technologies are (71) . The ultimate switched LAN, which is technically possible, now, exhibits the following characteristics:
1. High-speed yet cost-effective switching devices can be implemented on a wide scale, providing dedicated connections for individual users and supporting the aggregate (72) of all networked users.
2. The ability to deploy switching capabilities incrementally into the (73) base. Switching implementations support switching of individual users or groups so that existing users of shared media modules can continue to use the existing equipment until they can justify moving to dedicate switched LAN connections.
3. Support and enhancement of existing routed environments. Switching (74) routint, but rather can be introduced into the network without making any changes to the existing routing equipment or configuration. (75) play a critical role in the integration of switching into existing networks.

A. device B. distributedC. installed D. integrated