问题
单项选择题
当发现已喷锚区段的围岩有较大变形或锚杆失效时，应立即在该区段增设加强锚杆，对其长度的要求是（）。
A.只需原锚杆长度的0．5倍即可
B.不小于原锚杆长度的l．5倍
C.只需原锚杆长度即可
D.不小于原锚杆长度的3倍
答案
参考答案：B
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当发现已喷锚区段的围岩有较大变形或锚杆失效时，应立即在该区段增设加强锚杆，对其长度的要求是（）。
A.只需原锚杆长度的0．5倍即可
B.不小于原锚杆长度的l．5倍
C.只需原锚杆长度即可
D.不小于原锚杆长度的3倍
参考答案：B
In 1982, Steven Callahan was crossing the Atlantic alone in his sailboat when it struck something and sank．He got into a life boat, but his supplies were 21 ．His chances of surviving were small． 22 when three fishermen found him 76 days later, he was alive —much 23 than he was when he started, but alive． His 24 of how he survived is fascinating．His cleverness —how he 25 to catch fish, how he evaporated（蒸发） sea water to 26 fresh water—is very interesting． But the thing that 27 my eye was how he managed to keep himself going when all hope seemed lost, and there seemed no 28 in continuing the struggle．He was starved and 29 worn-out．Giving up would have seemed the only possible choice． When people 30 these kinds of circumstances, they do something with their minds that gives them the courage to keep going．Many people in 31 desperate circumstances 32 in or go mad．Something the survivors do with their thoughts helps them find the courage to carry on 33 difficulties． "I tell myself I can 34 it," wrote Callahan in his book．-Compared to what others have been through, I'm fortunate．I tell myself these things over and over, 35 up courage．．．" I wrote that down after 1 read it．It 36 me as something important．And I've told myself the same thing when my own goals seemed 37 off or when my problems seemed too terrible．And every time I've said it, I have always come back to my 38 ． The truth is, our circumstances are only bad 39 to something better．But others have been through the much worse, that is, in comparison with what others have been through, you're fortunate．Tell this to yourself over and over again, and it will help you 40 through the rough situations with a little more courage．
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