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【单选题】
( )污染为食品的物理性污染。A.
N-硝基化合物
B.
酒中的醛类
C.
放射性污染
D.
滥用食品添加剂
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举一反三
【单选题】Norbert Wiener discovered the concept of feedback when he was working in World War 2. What was he working on?
A.
Taking care of wounded soldiers
B.
Leadership qualities of army officers
C.
Breaking the German code of communication
D.
Building rockets
E.
Anti aircraft guns
【单选题】夹层腹主动脉瘤的超声表现描述，以下错误的是（）
A.
腔内见条带结构，两端连于腹主动脉侧壁
B.
两腔内回声变化不一致
C.
腔内细条带可随意摆动
D.
腹主动脉可继发扩张，搏动较弱
E.
真腔内彩色血流带较亮，假腔内色彩较暗
【简答题】某企业拟进行股票投资,现有甲、乙两只股票可供选择,具体资料如下: 经济情况 概率 甲股票预期收益率 乙股票预期收益率 繁荣 0.3 60% 50% 复苏 0.2 40% 30% 一般 0.3 20% 10% 衰退 0.2 -10% -15% 要求: (1)分别计算甲、乙股票收益率的期望值、标准差和标准差率,并比较其风险大小; (2)假设投资者将全部资金按照60%和40%的比例分别投资购买甲、乙股票...
【单选题】夹层腹主动脉瘤的超声表现描述,错误的是
A.
腔内见条带结构，两端连于腹主动脉侧壁
B.
两腔内回声变化不一致
C.
腔内细条带可随意摆动
D.
腹主动脉可继发扩张，搏动较弱
E.
真腔内彩色血流带较亮，假腔内色彩较暗
【单选题】When he was working there he caught a serious illness from _____ effects he still suffers.
A.
which
B.
that
C.
whose
D.
what
【单选题】Norbert Wiener discovered the concept of feedback when he was working in World War II. What was he working on?
A.
Taking care of wounded soldiers
B.
Leadership qualities of army officers
C.
Breaking the German code of communication
D.
Building rockets
E.
Anti aircraft guns
【简答题】社交礼仪的四大原则指的是什么？
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