下列关于设备寿命的叙述，正确的有（）。 A.自然寿命主要由设备_爱下问搜题

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问题多项选择题

下列关于设备寿命的叙述，正确的有（）。

A.自然寿命主要由设备的有形磨损所决定的

B.设备的自然寿命不能成为设备更新的估算依据

C.设备使用年限越长，所分摊的设备年资产消耗成本越少

D.经济寿命由维护费用的提高和使用价值的降低决定的

E.设备的技术寿命主要是由设备的有形磨磨决定的

答案

参考答案：A, B, C, D

单项选择题 A1/A2型题

乳酸性酸中毒时血乳酸大于（）

A.3mmol／L

B.1mmol／L

C.2.5mmol／L

D.0.5mmol／L

E.10mmol／L

完形填空

Soon it would be the holidays, but before that, there were year exams. All the 36 had been working hard for some time, reviewing their lessons for the exams. If they didn’t 37 , they would have to retake them in September. There were usually a few who 38 , but Jane didn’t want to be one of them. She had worked hard all year, 39 just before the exams she was working so hard that her sister Barbara was 40 about her. She went to bed too 41 . The night before the first exam, Barbara 42 that she have an early night and take a 43 pill. She promised to wake 44 up in the morning.
As she was falling asleep, Jane was afraid that she might oversleep. Her 45 kept jumping from subject to subject. At last, with the help of 46 , she went to sleep. In no time at all, she was sitting in the examination hall, looking at the examination 47 , but she couldn’t answer any of the questions. 48 around her was writing pages and gages. 49 she thought hard, she couldn’t find anything to write 50 . She kept looking at her 51 . Time was running out. There was only an hour to go. She started one question, wrote two sentences, 52 and tried another one. With only half an hour left she wrote another two sentences. By this time she was so worried that she started 53 . Her whole body shook. It shook so much that she 54 up. She was still in bed and it had all been a 55 dream. A minute later, Barbara called her name.

B．her parents

C．the lessons

D．the medicine

A．The teacher

B．The students

C．looked around

D．thought over