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【判断题】
贫铀弹也会发生链式核反应,是核武器的一种。A.
正确
B.
错误
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举一反三
【单选题】It is amazing that the little boy can swim ________the river ________100 meters in width.
A.
across; measuring
B.
over; measured
C.
across; measure
D.
through; measuring
【单选题】在一个单因子试验中，因子A有4个水平，在每一水平下重复进行了4次试验，由此可得每一水平下样本标准差Si，i=1，2，3，．4，它们分别为0．9，1．4，1．0，1．1，则误差平方和为（）。
A.
4
B.
136
C.
194
D.
98
【单选题】有以下程序 #include "stdio.h" int fun(int x[], int n ) { static int sum=0, i; for(i=0; i return sum; } main() { int a[]={1,2,3,4,5}, b[]={6,7,8,9}, s=0; s=fun(a,5)+fun(b,4); printf("%d\n", s); } 程序运行后输出的结果...
A.
45
B.
50
C.
60
D.
55
【单选题】There's a boy outside ______ is running across the road from that house.
A.
which
B.
who
C.
that
【单选题】The boy's ______ expression on his face suggested that he must have met across something______. [ ]
A.
terrifying；terrified
B.
terrified；terrifying
C.
terrified；terrified
D.
terrifying；terrifying
【单选题】在单因子试验中A有3个水平,每一水平下进行了4次试验,并求得因子与误差平方和分别为SSA=58.35,SSe=46.85,在给定a=0.05的水平上因子A的显著性质为【F0.05(2,9)=4.26】:
A.
显著的
B.
不显著的
C.
总是显著的
D.
总是不显著的
【单选题】It is amazing that the little boy can swim ________the river ________100 meters in width.
A.
across; measuring
B.
over; measured
C.
across; measured
D.
through; measuring
【单选题】The boy comes out of the room_______ the window.
A.
through
B.
over
C.
cross
D.
across
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