在Rt△ABC中,如果每个边都缩小为原来的14,则锐角A的余弦值( ) A.缩小1

题型:选择题

问题:

在Rt△ABC中,如果每个边都缩小为原来的
1
4
,则锐角A的余弦值(  )
A.缩小
1
4
B.扩大4倍C.没有变化D.不能确定
考点:锐角三角函数的定义
题型:选择题

某地因工业事故,使多人CO中毒,其中昏迷者被送到医院。此时最有效的抢救措施是()。

A.鼻导管吸氧

B.20%甘露醇快速静脉滴入

C.亚冬眠治疗

D.高压氧治疗

E.血液透析

题型:选择题

患者男性,67岁,高血压病史10年,因头痛、神志不清收入院。查体发现右下肢皮肤温度较左下肢低,足背动脉搏动弱,床头B超发现腘静脉栓塞,治疗原则不正确的是()

A.普通肝素先以801U/kg的负荷量静脉推注

B.6小时复查APTT,根据APTT调整剂量,使APTT在正常1.5~2.5倍范围内

C.低分子肝素每日1~2次,无需调整剂量

D.内生肌酐清除率<30ml/min时慎用

E.肝素可导致血小板减少症

题型:选择题

下列各项中,梁所采用材料、截面均相同,在受相同的均布荷载作用下,其中挠度最小的是()。

A.A

B.B

C.C

D.D

题型:选择题

Fran, Gram and Hen registered a private limited company Ire Ltd in January 2005 with a share capital of €300, which was equally divided between them, with each of them becoming a director of the company.Although the company did manage to make a small profi t in its fi rst year of trading, it was never a great success and in its second year of trading it made a loss of €10,000.At that time Fran said he thought the company should cease trading and be wound up. Gram and Hen, however, were insistent that the company would be profi table in the long-term so they agreed to carry on the business, with Fran taking less of a part in the day-to-day management of the business, although retaining his position as a company director.In the course of the next three years Gram and Hen falsifi ed Ire Ltd’s accounts to disguise the fact that the company had continued to suffer losses, until it became obvious that they could no longer hide the company’s debts and that it would have to go into insolvent liquidation, with debts of €100,000.Required:Advise Fran, Gram and Hen as to any potential liability they might face as regards:

(a) fraudulent trading, under both criminal and civil law; (5 marks)

题型:选择题

欲快速制备甲基纤维素水溶液,宜采用()。

A.甲基纤维素直接溶于热水中

B.甲基纤维素先分散于冷水(总水量1/4)中,再加入80℃热水

C.甲基纤维素先分散于热水(80℃,总水量的1/4)中,再加入冷水

D.甲基纤维素先直接于冰水中

E.甲基纤维素溶于甘油,再与水混溶

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