有关胆道蛔虫症的临床表现，错误的是A．呕吐蛔虫史 B．疼痛呈间歇性发作 C．伴恶心、

搞好兴奋剂管理是确保2008年奥运会成功举办的主要措施之一．国家体育总局转发了世界兴奋剂机构《2008年禁用清单》，违禁药物有216种，甲异炔诺酮（tibolone）是其中之一，它的结构式如右图，下列有关说法不正确的是（　　）

A．甲异炔诺酮中含有的官能团有羟基、碳碳叁键、碳碳双键及羰基

B．甲异炔诺酮分子中含有4个手性碳原子

C．1mol甲异炔诺酮在浓硫酸作用下脱去1分子水，所得产物有两种

D．1mol甲异炔诺酮与足量的氢气催化加成，最多消耗4molH₂

屋面工程技术规范（GB50345-2012）：找坡层和找平层的施工环境温度不宜低于（）℃。

A.0

B.负温

C.5

D.10

对于已被停牌的股票，深圳证券交易所则规定，直至有披露义务的当事人做出公告的当日( )复牌。

A．9:00

B．9:30

C．10:00

D．10:30

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) .

30().

A. throwing

B. turning

C. lowering

D. setting

什么是逻辑校验？试举例说明。