王会计在记帐时发现现金少了153.9元，查帐后得知是一笔支出款的小数点看错了一位

The network layer provides services to the transport layer．It can be based on either (71) ．In both cases，its main job is (72) packets from the source to the destination．

In network layer，subnets can easily become congested，increasing the delay and (73) .

for packets．Network designers attempt to avoid congestion by proper design．Techniques include (74) policy，caching，flowcontrol，and more．

The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service．The methods that can be used for this include buffering at the client，traffic shaping，resource (75) ，and admission control．Approaches that have been designed for good quality of service include integrated services(including RSVP) ，differentiated services， and MPLS．

（74）处填（）。

A．abandonment

B．retransmission

C．checksum

D．synchronism

滋养体为感染期的原虫是（）

A.溶组织内阿米巴

B. * * 毛滴虫

C.疟原虫

D.蓝氏贾第鞭毛虫

E.结肠小袋鞭毛虫

根据《担保法》，当事人对保证方式没有约定或者约定不明确的，( )。

A．按照一般保证承担保证责任
B．按照连带责任保证承担保证责任
C．保证合同无效
D．保证人任意选择一般保证或连带责任保证方式承担保证责任

营气分布于（）

A.胸中

B.脉外

C.脉内

D.上焦

E.下焦

不合格水泥就是废品水泥。