- 卤代烃
- 共1238题
What does the passage mainly discuss
A.The increase of private mail service.
B.A comparison of urban and rural postal services.
C.The development of government postal system.
D.The history of postage stamps.
正确答案
C
解析
暂无解析
The flowers in the vase ______ because they had no water.
A.ripened
B.withered
C.decreased
D.shriveled
正确答案
B
解析
(wither凋谢)。句意为:花瓶中的花凋谢了,因为它们缺水。A.ripen成熟;C.decrease减少;D.shrivel枯萎。
To drive his point home, the author ______.
A.gives a lot examples of the adversity
B.uses an inductive approach
C.describes the favorable conditions in detail
D.explains everything in a persuasive manner
正确答案
A
解析
暂无解析
A human quality apparently not essential in someone who works with concrete is ______.
A.carefulness
B.patience
C.self-control
D.inventiveness
正确答案
D
解析
对于水泥预制品的制作人员,作者强调了他必须耐心,细心,有计划。
不属于成分输血的优点的是
正确答案
解析
输注血液成分的优点:1.高效制品的容量小,有效成分的浓度和纯度高,针对性强,治疗效果好。2.安全不良反应少,使用相对安全,减少输血相关传染病的发生。不同血液成分携带病毒的概率也不相同,以白细胞最大,血浆次之,红细胞最小。3.有效保存,血液成分需在适当条件下保存,才能保留其生物活性。4.保护血液资源充分合理地利用血液资源。成分血和全血均能有效改善血容量。故E错。
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