铁路营业线施工按组织方式、影响程度分为（）两类。
A.施工和检修
B.施工和维修
C.垂直和V型
D.作业和检修
参考答案：B
对于下列经济业务活动，依照《会计法》的规定，应当办理会计核算的有______。
A．款项和有价证券的收付
B．财务成果的计算和处理
C．收入、支出、费用、成本的计算
D．债权、债务的发生和结算
Packet-switching wireless networks are preferable (1) when transmissions are (2) because of the way charges are (3) per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are (4) for the (5) of time they use the network.
1（）
A．to
B．for
C．than
D．only
