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【单选题】
在卡方检验中,自由度的计算为A.
R*C
B.
n
C.
n-1
D.
(R-1)*(C-1)
E.
对子数-1
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举一反三
【单选题】C#数组主要有三种形式,它们是:
A.
一维数组、多维数组、不规则数组
B.
一维数组 、二维数组、三维数组
C.
整型数组、浮点型数组、字符型数组
D.
一维数组、二维数组、多维数组
【单选题】Which of the following actions should be taken first to control an oil fire in a fuel oil tank?
A.
commence draining that tank as quickly as possible
B.
seal off all vents to that tank
C.
activate the CO2 system to that tank
D.
shut off the steam heating coils
【单选题】The fire of fuel oil is classified as a ____fire.
A.
class A
B.
class B
C.
class C
D.
class D
【单选题】Which of the actions listed should be taken FIRST to control an oil fire in a fuel oil tank?
A.
Commence draining that tank as quickly as possible
B.
Seal off all vents to that tank
C.
Activate the CO2 system to that tank
D.
Shut off the steam heating coils
【单选题】有以下四个结论： ①lg（lg10）=0； ②lg（lne）=0； ③若e=lnx，则x=e 2 ； ④ln（lg1）=0． 其中正确的是（ ）
A.
①②
B.
①②③
C.
①②④
D.
②③④
【单选题】The fire of fuel oil is termed _______fire.
A.
class“A”
B.
B class“ B ”
C.
class“C”
D.
class“D”
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