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【单选题】
样品的包装检查()。A.
品名填写是否规范、编号是否齐全
B.
包装完整情况、密封是否有人为的拆动
C.
采样时间、采样点和采样人是否填写
D.
编号、质量、贮存方式是否填写
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】下列关于补体系统的描述，正确的是（ ）
A.
补体成分大多数以非活性的酶前体存在于血清中
B.
补体系统激活的三条途径均是酶的级联反应
C.
补体系统在非特异性免疫和特异性免疫中发挥作用
D.
补体系统的激活具有放大效应
E.
激活的补体具有生理作用和病理作用
【单选题】When there is a fire in a large electric motor, normally the very FIRST step is to _____.
A.
secure the electric supply
B.
ventilate area to remove smoke
C.
start the fire pump and lead out hose
D.
apply foam
【单选题】External economies of scale often arise because similar firms
A.
locate in the same geographic region.
B.
collude to fix prices and increase profits.
C.
have excellent internal logistics.
D.
agree to cooperate to expand global trade.
E.
have economies of scale in production.
【单选题】Internal economies of scale
A.
may be associated with a perfectly competitive industry.
B.
cannot be associated with a perfectly competitive industry.
C.
are associated only with sophisticated products such as aircraft.
D.
cannot form the basis for international trade .
E.
None of the above.
【简答题】写出下列随机试验的样本空间S： (1) 记录一个班一次数学考试的平均分数(设以百分制记分)． (2) 生产产品直到有10件正品为止，记录生产产品的总件数. (3) 对某工厂出厂的产品进行检查，合格的记上“正品”，不合格的记上“次品”，如连续查出了2件次品就停止检查，或检查了4件产品就停止检查，记录检查的结果. (4) 在单位圆内任意取一点，记录它的坐标.
【简答题】internal economies of scale
【单选题】When children are about four years old, they are the most ______.
A.
original
B.
vigorous
C.
curious
D.
ambitious
【简答题】When you are finished with the electric iron, don’t forget_____(关掉它). (turn)
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