国有快递企业主要是指邮政、铁路、民航、交通等部门的国有控股企业。

如图所示是某医院的应急供电线路示意图。柴油发电机到用电区的输电线路所用导线单位长度的电阻为5×10^－4 Ω/m ，柴油发电机的输出电压为260V 。用电区内每个用电器的额定电压均为220V ，总功率为44kW ，当这些用电器都正常工作时，求：

⑴输电线路中的电流多大？

⑵输电线路损失的电功率是多少？

⑶发电机与用电区间的距离？

⑷若应急供电1小时，发电机效率为30%，医院最少需要准备多少柴油？（柴油的热值为4.0×10⁷J/kg）

A 37-year-old man in Australia’s Northern city Darwin ,Norm Pethrick, was praised for jumping onto a crocodile’s back to save his wife Wendy at Litchfield National Park, a popular tourist spot southwest of Darwin, a local newspaper reported.

Ms Pethrick was standing on a river bank Wednesday afternoon when the saltwater crocodile lunged (扑), locking its jaws on both her legs as it tried to drag her underwater. Norm Pethrick, who with his wife had been collecting water, immediately went to help her. He jumped onto the back, poked (戳) the eyes of the crocodile and finally got his wife free. Ms Pethrick was later taken to Hospital for a medical treatment. The doctors said she was suffering eight puncture wounds (伤口) in her right leg, a puncture wound in her left leg and a serious cut to one of her fingers.

“This could have been a fatal and tragic situation,” said Dr Len Notaras, according to a local report. He said Ms Pethrick was saved by her husband’s “quick and diligent actions”. Dr Notaras also said she would remain in hospital for three more days and have an operation to clean the wounds, which are easy to get infected because of bacteria (细菌) on the teeth of the crocodile.

小题1: This passage is most likely to be found in _____.

A．a newspaper

B．a travel guide

C．a textbook

D．a novel小题2:The crocodile attacked Ms Pethrick when she was ______.

A．swimming in the river

B．watching the crocodile

C．standing on the river bank

D．fishing in the water小题3:According to the passage, Norm Pethrick can be described as following EXCEPT ______.

A．brave

B．diligent（勤勉的）

C．quick

D．humorous小题4:Which of the following would be the best title for this passage?

A．The husband should save the wife

B．A man saves wife’s life from crocodile’s jaws

C．A crocodile is not so dangerous as people imagine

D．Human beings can beat crocodiles sometimes

下列选项中哪项是结肠息肉最主要的临床表现（）

A.便血

B.呕吐

C.腹胀

D.便秘

E.腹泻

为什么糖原降解选用磷酸解，而不是水解？

综合：