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【单选题】
下列属于星形拓扑的优点的是()A.
简单的访问协议
B.
易于扩展
C.
电缆长度短
D.
不需接线盒
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举一反三
【简答题】补全对话，每空一词。 A: 1 is the matter with you,Tom? B: I 2 feel well.I feel tired and have a h 3 . A: I am sorry to 4 that. Now open your mouth and say 'Ah', please. Well, you've got a bad cold. I am going to...
【单选题】---I feel tired and sleepy. ---Why not stop______?
A.
resting
B.
lying
C.
to relax
D.
to work
【简答题】图11-30为乙烯-乙酸乙烯酯共聚物(EVA)的热失重曲线，实验证明第一失重阶段失重百分数为23%，其成分主要是乙酸，即按下面反应方程进行热降解。 试利用TG图上的有关数据，估算原共聚物中两种单体的组成比例。
【单选题】— I feel tired and sleepy. — Why not consider_________?
A.
to relax
B.
breaking
C.
resting
D.
to work
【单选题】--- I feel tired and sleepy. --- Why not stop ______?
A.
relaxing
B.
to relax
C.
resting
D.
to work
【简答题】乙烯一乙酸乙烯酯 - 氯乙烯接枝共聚物 , 其中乙烯单体单元为 36% 、乙酸乙烯酯单体单元为 24% 、氯乙烯单体单元为 40%, 外观为白色粉末 , 未加增塑剂 (2004 年试题) ___________
【单选题】听力原文：W: I'm losing my sleep. I feel tired and sleepy all the time. I've got to do something about it. M: I'm so sorry for you. But what are you going to do? W: I want to move out of the dorm and rent ...
A.
She has caught a cold.
B.
She has a headache.
C.
She feels fired and sleepy all the time.
D.
She is ill.
【单选题】---I feel tired and sleepy. ---Why not stop ______?
A.
to relax
B.
relaxing
C.
resting
D.
to work
【单选题】I usually walk ______ the river bank over there, but today I feel tired and won't walk far.
A.
as long as, so
B.
as far as, that
C.
as often as, such
D.
as soon as, very
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