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【单选题】
对某量做了 N次等精度观测,则该量的算术平均值精度为观测值精度的( )。A.
N倍
B.
倍
C.
1/ 倍
D.
N/2 倍
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举一反三
【单选题】There are currently _______ courts of appeals in the United States.
A.
10
B.
11
C.
14
D.
16
【单选题】There are currently ________ district courts in the United States.
A.
94
B.
92
C.
90
D.
13
【单选题】There are currently ________ district courts in the United States.
A.
52
B.
54
C.
92
D.
94
【单选题】There are currently _______ courts of appeals in the United States.
A.
10
B.
11
C.
9
D.
8
【单选题】There are currently _______ courts of appeals in the United States.
A.
10
B.
11
C.
12
D.
13
【单选题】____ ___ Universities in Britain are a magnet for overseas students. There are currently over 200 000 from outside Britain studying at British universities. The largest single group is Chinese student...
A.
B.
C.
C
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