某1年期零息债券的年收益率为12%，假设债务人违约后回收率为40%，若1年期的无风险

建设工程施工合同跟踪的含义包括( )。

A．承包单位的合同管理职能部门对合同执行者(项目经理部或项目参与人)的履行情况进行的跟踪、监督和检查

B．承包人对专业分包人合同执行情况的跟踪、监督和检查

C．发包人对承包人合同执行情况的跟踪、监督和检查

D．合同执行者(项目经理部或项目参与人)本身对合同计划的执行情况进行的跟踪、检查和对比

E．发包人对专业分包人合同执行情况的跟踪、监督和检查

死因包括主要死因、直接死因、辅助死因和（）

喹诺酮类药的抗菌机理是：

A．抗叶酸代谢
B．抑制细菌细胞壁合成
C．影响胞质膜的通透性
D．抑制细菌蛋白质合成
E．抑制细菌核酸代谢

A typical application of this (71) is ADSL. It is emerging as the technology for home-and small-office Internet connectivity. It provides either 1.5 Mb/s～8 Mb/s from the network to the user and 64 Kb/s～512 Kb/s in the reverse direction depending on the distance, 12 000 or 18 000 feet.. The different speed for each direction gives it the (72) label. ADSL is designed to take advantage of the fact that video-on demand, telecommuting, and Internet access traffic are inherently asymmetrical. The user (73) a brief message up to the network and receives a ton of data coming back, either a movie or a piece of data download. Under such a scenario, low-speed traffic to the network is just fine. ADSL delivers high (74) where you need it and only uses a single copper pair. Through multiplexing, it also reserves (75) of the bandwidth for POTS.

A．2kHz

B．4kHz

C．16kHz

D．64kHz