在灾难发生期间，下列哪一种应用系统应当首先被恢复（）。A、总账系统 B、供应链系统 C、

下列药物中，不属于儿茶酚胺的药物是

A．肾上腺素

B．去甲肾上腺素

C．异丙肾上腺素

D．多巴胺

E．麻黄碱

患者，男，51岁。尿频、尿痛间断发作2年，下腹隐痛、肛门坠胀1年。查体：肛门指诊双侧前列腺明显增大、压痛、质偏硬，中央沟变浅，肛门括约肌无松弛。前列腺液生化检查锌含量为1.76mmol/L，B超显示前列腺增大。

肿瘤病人的机体免疫状态（）

A.免疫防御过高

B.免疫监视低下

C.免疫自稳失调

D.免疫耐受增强

E.免疫防御低下

Complete the sentences with the given words in their proper forms (用括号中所给单词的适当形式完成下列句子。每空格限填一词)

小题1:Climb up to the _________ floor, and you can enjoy a better view. (eleven)

小题2:_________, Grace made up her mind to live abroad with her daughter. (final)

小题3:It is a very __________ book for language learners to improve writing skills. (use)

小题4:Don’t worry about your son. He is old enough to be independent and live by _________. (he)

小题5:The movie KungFu Panda II is sure to __________ a large number of teenagers. (attractive)

小题6:If you don’t go on a diet, it is __________ for you to lose weight. (possible)

小题7:The local people had to move away because of the serious _______. (pollute)

小题8:The great _______ gave his first show in Shanghai and the tickets sold out in minutes. (art)

直流电机的结构特点有哪些？

硬关井是在（）状态下，强行关闭防喷器的操作程序。

A.节流及放喷闸门关闭

B.节流闸门打开，放喷闸门关闭

C.节流及放喷闸门打开

D.节流闸门关闭，放喷闸门打开