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【单选题】
3个逻辑变量的表达式转换为真值表,可以有()取值组合
A.
3
B.
6
C.
8
D.
9
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【简答题】随机地从一批钉子中抽16枚,测得其长度(单位:cm)为: 2.14;2.10;2.13;2.15;2.13;2.12;2.13;2.10; 2.15;2.12;2,14;2,10;2.13;2.11;2.14;2.11. 设钉长服从N(μ,σ 2 )分布,取1-α=0.90,分别在两种情形下求μ的置信区间.并对α=0.1下检验H 0:μ =2.12.
【简答题】从一批钉子中随机抽取 16 枚 , 测得其长度 ( 单位 : cm ) 为 2.14, 2.10, 2.13, 2.15, 2.13, 2.12, 2.13, 2.10 2.15, 2.12, 2.14, 2.10, 2.13, 2.11, 2.14, 2.11 假设钉子的长度X 服从正态分布 , 在下列两种情况下分别求总体均值 μ 的置信度为90% 的置信区间。
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【单选题】if Mr. White won't agree to sign the contract, ( )
A.
neither she will
B.
neither won't she
C.
neither will she
D.
she won't neither
【单选题】Remember that you won't be able to cancel the contract ____you've signed.
A.
before
B.
until
C.
once
D.
though
【简答题】请通过电子税则找到编码“0105.99”,对应的二级子目条文“其他”共包括( )种家禽?请用小写数字回答。
【单选题】Which statement doesn't violate the 7C's principles?
A.
We export machines to many foreign countries.
B.
Your letter  has been receivered recently.
C.
We won't send goods to you until 10th March.
D.
The goods under Contract No.235 were shipped on S.S. "East Wind" on Feb.,20.
【单选题】能预防局麻药吸收过多中毒的药物是
A.
氯丙嗪
B.
异丙嗪
C.
肾上腺素
D.
哌替啶
E.
苯巴比妥钠
【单选题】---Bear in mind that you won't be able to cancel the contract ____you've signed. --- I _____.
A.
unless; do
B.
since; will
C.
once; will
D.
after; have
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