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【简答题】
Jungle country is not friendly to man, but it is possible to survive there. You must have the right equipment and you must know a few important things about woodcraft. Then your chances of staying alive are very good. No one should go into the jungle without the right equipment. You need lightweight clothing, a good knife and a compass. Fishhooks and a line, matches and a raincoat are necessary too. In the jungle you can get hopelessly lost within five minutes after leaving a known landmark. That is why you should always carry a compass. In open country, during the day, you can tell which way to go by studying the sun. At night the stars guide to direction. But in most places where it is impossible to see the sun or the stars, you must check your position by the compass. Keep alert. Watch the ground in front of you carefully. Stop and listen now and again. Avoid haste, and rest often. In a place that is hot and humid, the person who sets a fast pace will soon become tired. A steady, even pace is wisest in the long run. If you lose your way, don’t be afraid. Try to decide how long it has been since you were sure of your position. Mark the spot where you are with blazes on a tree and then you can begin retracing your steps. Except in an emergency, never try to travel through the jungle at night. Whenever possible, it is wise to follow streams and rivers that are going in your general direction. This may cause you many extra miles of travel. But in the end it will save time and energy. Nothing is more exhausting than hacking a trail cross-country through unbroken jungle.
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【判断题】“旷”美的景观视阈宽广无边,如“会当凌绝顶,一览众山小”的高旷之美。
A.
正确
B.
错误
【判断题】DNA双链中,指导合成RNA的那条链称作模板链。()
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正确
B.
错误
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【多选题】下列关于应力的描述中正确的是 。
A.
应力是内力的分布集度
B.
应力的单位是Pa,常用单位有MPa,1MPa=1x10 6 Pa
C.
一点处的总(全)应力等于正应力和切应力的代数和
D.
一点处的总(全)应力等于正应力和切应力的矢量和
E.
总应力就是平均应力
F.
切应力是与截面相切的应力
【多选题】下列关于F分布特性的描述中,正确的有
A.
F总为正值,是一个正偏态分布
B.
F总为正值,是一个负偏态分布
C.
F总是大于1
D.
当分子自由度为1,分母自由度为任意值时,F值与分母自由度相同概率的t值(双侧概率)的平方相等。
【简答题】请分析图 中电路的问题点?
【单选题】下列关于F分布的描述,正确的是( )
A.
F分布曲线是关于y 轴左右对称的 ‍
B.
F分布可由两个相互独立的卡方随机变量构造而成
C.
F分布的倒数是卡方分布 ‍
D.
t分布的倒数是F分布
【简答题】请分析图 中电路的问题点?
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A.
召温猛
B.
召苏翁
C.
法昂
D.
坤鹏
【简答题】下列关于F统计量及其分布的描述正确的是( )A. B. F分布的数学期望依赖于第一自由度m C. D.
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