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问题 单项选择题

CRH1A型动车组IDU的系统--外门界面上，车门状态指示信息显示区域显示全绿色，表示（）。

A.车门已开或被释放

B.车门关闭

C.车门已开或被释放，并有故障

D.车门关闭并有故障

答案

参考答案：A

单项选择题

The data station usually means a (71) unit that provides data for transmission, that accepts transmitted data, and that performs all functions necessary for communication with another functional unit. Data stations may be divided into two kinds, the primary stations and the secondary stations, (72) control functions.

In (73) data link control, the primary station is the data station that supports the primary control functions of the data link, generates commands to be transmitted, and interprets received responses. Specific responsibilities assigned to the primary station include initialization of control signal interchange, organization of data flow and actions regarding error control and error recovery functions. The secondary station executes data link control functions as (74) by the primary station, interprets received commands and (75) responses to be transmitted.

（72）处填（）。

A．helped

B．aided

C．in terms of

D．supporting
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单项选择题

(21～22题共用题干)患者，男性，50岁，持续下腹部隐痛2个月，食欲差，多次大便潜血阳性。查体：消瘦，面色苍白，下腹部压痛，未触及包块。行CT检查未见明显异常，为进一步诊断，来院就诊。

应首选的检查方法是

A．腹部X线平片

B．腹部超声

C．99mTc-RBC显像

D．MRI

E．胃、肠镜
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