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【单选题】
如图,设筋直径为20其中,混凝土强度为C30,保护层为15,支座宽300,居中布置,板厚120,分布筋间距250,连接绑扎。问1号筋长度是()
A.
1300
B.
1595
C.
1640
D.
1610
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【判断题】已知连续型的随机变量分布函数 , 为概率密度,则 ( ).A. 对 B. 错
A.
正确
B.
错误
【单选题】有关绦虫成虫的特征,描述错误的是
A.
均为雌雄异体
B.
虫体扁平分节
C.
头上有固着器官
D.
消化道简单
【单选题】No one could say how the magician was able to pull a rabbit out of his hat until he later ______________ his tricks.
A.
threw light on
B.
take light on
C.
take out
D.
took out
【单选题】Could you me how to it in Chinese? [     ]
A.
say ; speak
B.
speak ; say
C.
tell ; say
D.
say ; tell
【单选题】已知连续型随机变量 X 的概率密度函数为: 则,X的方差D( X )等于 (本题10.0分)
A.
0.4
B.
0.5
C.
0.6
D.
0.7
【单选题】I loved the cabin in the village because it ’s full of() charm.
A.
urban
B.
city
C.
rustic
D.
common
【简答题】已知连续型随机变量X的概率密度函数为f(x),则P(X=4.5)= 。
【简答题】完形填空。 Hi, my name is Jeff. Last summer I had a l vacation.  I went  across We drove six to eight the USA 2 my parents by car. 3 a day. In big cities, we stayed in big hotels. The food 4 usually delici...
【简答题】完形填空 Hi, my name is Peter. Last summer I had a 1 vacation. I went across  the USA 2 my parents by car. We drove six to eight 3 a day. In big cities, we stayed in big hotels. The food 4 usually delicio...
【判断题】已知连续型随机变量【图片】的概率密度函数为【图片】,【图片】为常数,则【图片】.
A.
正确
B.
错误
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