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【单选题】
儿童1岁时头围与胸围的增长曲线形成交叉，这说明胸围生长发育是A.
正常
B.
低体重
C.
肥胖
D.
消瘦
E.
以上都不是
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【单选题】设 与 分别为任意两个随机变量的分布函数,令 ,则下列各组数中能使 为某随机变量的分布函数的有( )。
A.
a=3/5,b=2/5
B.
a=2/3,b=2/3
C.
a=3/2,b=1/2
D.
a=1/2,b=3/2
【简答题】用单词的适当形式填空。 1. It was difficult ________(build) the railroad for us. 2. What's ________ (he) name ? 3. Are those ________ (girl) your ________ (classmate) ? 4. He ________ (wave) to me and smiled . 5...
【单选题】设F1(x)与F2(x)分别为任意两个随机变量的分布函数，令F(x)=aF1(x)+bF2(x)，则下列各组数中能使F(x)为某随机变量的分布函数的有( )．
A.
a=3/5，b=2/5
B.
a=2/3，b=2/3
C.
a=3/2，b=1/2
D.
a=1/2，b=3/2
【单选题】一列快车从甲地驶往乙地，一列特快车从乙地驶往甲地，快车的速度为100千米/小时，特快车的速度为150千米/小时，甲乙两地之间的距离为1000千米，两车同时出发，则图中折线大致表示两车之间的距离y（千米）与快车行驶时间（小时）之间的函数图象是（ ）
A.
B.
C.
【简答题】完型填空。 Jack lost (丢失) his job last week. It was difficult for him to find another 1 . 2 told him that it was possible to get a new one in a town two hundred kilometers 3 . He decided to get there 4 . S...
【简答题】compensate regulate estimate fire off 5. It was difficult to ________ how many people had been wounded in the earthquake. 6. I _________ a letter of complaint to the manager of the store as soon...
【简答题】The window were replaced last week during routine _______ (maintain). 2. I would like to express my ______ (appreciate) and thanks to you all. 3. I’ve always understood one should try and be ______ (c...
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