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【单选题】
下列那种接地是防止电磁干扰的最佳保护方法。
A.
交流工作接地
B.
安全保护接地
C.
直流接地
D.
屏蔽接地
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【单选题】两个样本均数比较作t检验,其他条件不变,犯第II类错误的概率最小的是
A.
α=0.05
B.
α=0.01
C.
α=0.1
D.
α=0.2
E.
该问题提法不对
【简答题】Both Tom and Jack ____my friends. (is, are)
【判断题】重复抽样抽需要的样本单位数目总是比不重复抽样的多。( )
A.
正确
B.
错误
【判断题】重复重样需要的样本单位数目总是比不重复抽样的多。
A.
正确
B.
错误
【简答题】Friends come to visit us in the evening, they spend their time telling us they are in a hurry and looking at their watches . It isn’t that our friends are all very busy, it is just that when we haven’...
【单选题】Both you and he _____ my friends. [     ]
A.
is
B.
are
C.
am
D.
be
【简答题】My father was in the navy, which meant that my mother was married to both my father and the sea. As was often the case, we had to pack our belongings into boxes and those we had grown to love. We woul...
【多选题】非齐次状态方程的解,与以下哪些有关?
A.
矩阵 A
B.
矩阵 B
C.
矩阵 C
D.
矩阵 D
E.
状态初值
【单选题】My friends and I are interested in drawing, but _____ of us is good at it. [     ]
A.
neither
B.
both
C.
none
D.
all
【单选题】I will make friends with _______shares both my joys and sorrows.
A.
that
B.
anyone
C.
whoever
D.
whomever
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