标有“220V”，单而定功率标注不清的电动机，其电阻为4Ω，它正常工作时的电流I

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) .

38（）

A.ever 

B.just 

C.almost 

D.never

粮油仓厂竖向布置的形式有：（）、（）、（）三种。

某同学在探究常见金属活动性顺序后，明确了A、B、C三种金属在常见金属的活动性顺序表中的位置如下，请回答下列问题．

Mg   Al   A   Fe   Pb  （H） B   Hg   C   Au

金属活动性由强到弱

（1）在A、B、C三种金属中，能与稀盐酸发生反应的是______，最不活泼的是______．

（2）若B是铜，则下列有关的化学方程式书写正确的是______（填序号）．

a．Cu+MgSO₄=CuSO₄+Mg    b．Fe+CuSO₄=FeSO₄+Cu

（3）在学习和日常生活中，铁的金属活动性比金强的事例不少，请你举一例加以说明：

______．

隋朝开凿大运河的社会作用不包括（）

A.加强南北联系

B.便于隋炀帝南巡

C.巩固国家统一

D.促进南北经济交流

下列各题使用如下关系：
客户(客户号，名称，联系人，邮政编码，电话号码)
产品(产品号，名称，规格说明，单价)
订购单(订单号，客户号，订购日期)
订购单名细(订单号，序号，产品号，数量)

查询尚未最后确定订购单的有关信息的正确命令是( )。

A．SELECT名称，联系人，电话号码，订单号FROM客户，订购单
WHERE客户.客户号=订购单.客户号AND订购日期IS NULL

B．SELECT名称，联系人，电话号码，订单号FROM客户，订购单
WHERE客户.客户号=订购单.客户号AND订购日期=NULL

C．SELECT名称，联系人，电话号码，订单号FROM客户，订购单
FOR客户.客户号=订购单.客户号AND订购日期IS NULL

D．SELECT名称，联系人，电话号码，订单号FROM客户，订购单
FOR客户.客户号=订购单.客户号AND订购日期=NULL