投资控制是项目控制的主要内容之一，其表达的含义包括（）等。

A.项目投入，即把人力、物力、财力投入到项目实施中 

B.收集实际数据，即对工程进展情况进行评估 

C.把投资目标的计划值与实际值进行比较 

D.检查实际值与计划值有无偏差，如果有微小偏差，则工程继续进展 

E.在工程进展过程中，必定存在各种各样的干扰，如恶劣天气、设计出图不及时等

In data communication, data link is those parts of two data terminal equipments that are controlled by a protocol along with the (71) data circuit, which together enable data (72) . So-called protocol means, in short, a set of rules that determines the behavior of functional units in achieving communication.

Data circuit, however, consists of a pair of (73) transmission channels that provides a means of two-way data transmission. Between data switching exchanges, the data circuit may or may not include data circuit-terminating equipment (DCE), depending on the type of (74) used at the data switching exchange. Between a data station and a data switching exchange or data concentrator, the data circuit includes the DCE at the data station end, and may include equipment (75) to a DCE at the data switching exchange or dam concentrator location.

（72）处填（）。

A．transfer

B．transmission

C．passing

D．delivery