空气滤清器应如何保养？

若命题p：∀x∈R，x²-1＞0，则命题p的否定是 ______．

建设项目信息是指报告、数据、( )、安排、会议等与项目实施有直接或间接关系的各种信息。

A．计划

B．材料

C．制度

D．风险

女性，48岁。因"与人吵架后斜颈、咀嚼动作增多、脾气大、烦躁半年余"求治。患者半年前与人吵架后怄气，随即出现斜颈，咀嚼动作增多，感到脚底冒冷气，容易疲劳，躺在床上休息时，不能很轻松入睡。食欲明显减退，焦躁不安，常因小事发脾气，事后又非常后悔。由于反复发作，患者极为痛苦。经营一家水果店，生意基本未受影响；家庭支持好。家族史：两系三代无精神病史。性格：内向，不善言谈。

该患者最重要、最有效的治疗方法是（）

A.药物治疗

B.心理治疗

C.心理治疗合并药物治疗

D.心理治疗合并无抽搐电休克治疗

E.躯体疾病治疗

F.无抽搐电休克治疗

In June 1985, two British mountaineers Joe Simpson and Simon Yates made the first-ever climb of the 21,000-foot snow-covered Siula Grande mountain in Peru. It was an exceptionally (26) job, but nothing compared to what was to (27) . Early in the process, Simpson (28) and broke his right knee. Yates could have (29) him but managed to find a way of (30) him down the mountains on a rope in a series of difficult drops. Then Simpson fell into a crevasse and Yates eventually had no (31) but to cut the (32) , completely convinced that his friend was now (33)

In his book on the (34) , Joe Simpson wrote:

(35) I looked at the distant moraines, I know that I must at least try I would probably (36) there among those rocks. If I died, well, that wasn’t so (37) , but I wouldn’t have (38) waited for it to happen. The (39) of dying no longer affected me as it had in the crevasse at first. I now had a chance to (40) it and struggle against it.

The survival of Yates himself was (41) . That Simpson somehow found a way of (42) out of the crevasse after 12 hours and then crawled and (43) himself six miles back to camp, (44) three days and might without food or drink, would be considered as a heroic fiction. But in fact it was so (45) .

36().

A. stick out

B. hold out

C. hang out

D. die out