题目内容
(请给出正确答案)
[单选题]
下列公式中()是正确的。
A. T反应≧T探测+T延迟
B. T反应=T探测+T延迟
C. T反应≦T探测+T延迟
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A. T反应≧T探测+T延迟
B. T反应=T探测+T延迟
C. T反应≦T探测+T延迟
A.t的取值范围是(-∞,+∞)
B.t的自由度是n-1
C.t分布的密度曲线是左右对称的
D.当t=0时,t分布的密度函数取得最大值
E.当自由度一定时,t分布两尾概率越大,临界t值的绝对值越大
下列哪个表示为国家强制性标准。 ()
A.“GB/T”
B.“GB”
C.“DA/T”
D.“DB”
A.IΔ>30mA,TΔ=0.1s
B.IΔ=30mA,TΔ>0.1s
C.IΔ>30mA,TΔ>0.1s,IΔ•TΔ≯30mA •0.1s
D.IΔ>30mA,TΔ>0.1s
Smoking ____ inpublic in many countries.
A.doesn’t allow
B.isn’t allowed
C.hasn’t allowed
D.didn’t allowed
A.wouldn't exist
B.wouldn't have existed
C.doesn't exist
D.has existed
The volunteers must have broadened the road yesterday, _______?
A.mustn’t they
B.haven’t they
C.didn’t they
D.weren’t they