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【简答题】
用括号中所给词的正确形式填空。 Ar e you intereste d in mountain _____( climb ) ? Are you a mountain climber? Perhaps you think it's too _______ ( danger) to climb t he mountains, but there are lots of mountain climbers in the world. They aren't afraid of ________ (take) risks. They think taking risks is one of the exciting things about ________ ( do) dangerous sports . Some of them lose their lives because of the accidents, and others hurt _______ ( them), but they never give It up. Aron Ralston is one of them. Aron Ral ston is an American mountain climber. He _______ ( have) a terrible accident on April 26 , 2003. On that day, his right arm was _______ ( catch) under a 360-kilo rock. In order to save himself. He had to cut off the arm using his knife by himself Then, with his left arm, he bandaged himself so that he would not lose too much ______ (blood). After that he climbed down the mountain _______ ( find) help . After the accident, he wrote a book ________(call) Between a Rock and a Hard Place .
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【单选题】设函数在点 处连续,则f(x)在点 满足 ( )
A.
极限不存在
B.
极限存在等于
C.
不一定有定义
D.
极限存在但不一定等于
【单选题】下列选项中,用于实现接口的关键字是 ( )
A.
class
B.
abstract
C.
interface
D.
implements
【单选题】利用光电比色计测定菌悬液的光密度 时选择的波长时
A.
280nm
B.
480nm
C.
600nm
D.
540nm
【单选题】根据《公共场所空气中甲醛测定方法》(GB/T18204.26-2000)(酚试剂分光光度法)测定空气中的甲醛时,绘制标准曲线时与样品测定时( )。
A.
温度应完全一致
B.
不受温差影响
C.
温差应不超过5℃
D.
温差应不超过2℃
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A.
正确
B.
错误
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A.
无定义
B.
可导
C.
有极限
D.
不可导
【单选题】以下关于甲醛浓度测量说法错误的是
A.
常采用酚试剂比色法和乙酰丙酮分光度法
B.
酚试剂比色法在采样体积为10L时最低检出浓度为0.01mg/m3
C.
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D.
按照测量工况下大气压和室内温度对应的采样体积计算甲醛浓度
【单选题】According to the article we can calculate that the overall sales of US agribusiness market in 1977 were about ________.
A.
$43.6 billion
B.
$131 billion
C.
$150 billion
D.
$68.6 billion
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A.
正确
B.
错误
【简答题】若对于定义在R上的函数 ,其函数图象是连续不断,且存在常数 ( ),使得 对任意的实数x成立,则称 是 伴随函数. 有下列关于 伴随函数的结论: ① 是常数函数中唯一一个 伴随函数; ② 是一个 伴随函数; ③ 伴随函数至少有一个零点. 其中不正确的结论的序号是_________________.(写出所有不正确结论的序号)
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