搜题请搜索小程序“爱下问搜题”
问题 单项选择题

环型拓扑的局域网使用的介质访问控制方法是

A．CSMA/CD

B．Token Bus

C．CSMA

D．Token Ring

答案

参考答案：D

解析： 环型局域网采用Token Ring介质访问控制方法。

单项选择题

A school-aged child is admitted to the hospital with newly diagnosed, insulin-dependent diabetes mellitus. On admission his blood sugar is 180 mg/dL. His urine tests negative for ketones. He receives 10 units of regular humulin insulin subcutaneously half hour after admission. What should the nurse do next

A. Carefully regulate an intravenous solution of normal saline and insulin at 2. 5 hours after admission.
B. Encourage the child to drink at least 500 mL of a sugar-free clear liquid 1.5 hours after admission.
C. Begin intravenous administration of 5% dextrose in water 1 hour after admission.
D. Assess the child 2. 5 hours after admission for shakiness, feelings of anxiety, or decreased level of consciousness.
查看答案
单项选择题 A1/A2型题

下列措施中不能有效避免铸件出现毛刺的是（）。

A.按照要求加温铸圈

B.用真空包埋机进行包埋

C.使包埋材料与铸模材料的膨胀率一致

D.包埋前仔细去除铸模上多余的蜡

E.避免铸圈反复多次焙烧
查看答案