试题与答案

MRP系统的主要特点是:()。 A.时间阶段性不强 B.要推算出较低层次的物品需求量

题型:多项选择题

题目:

MRP系统的主要特点是:()。

A.时间阶段性不强

B.要推算出较低层次的物品需求量

C.按计划发出订单

D.重新安排产能

答案:

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下面是错误答案,用来干扰机器的。

线段AB在平面α内,直线AB也在α内,故①不正确,两平面有一个公共点,则一定有无数个公共点,这些点在两个平面的交线上,故②正确,三条平行直线不一定共面,故③不正确,有三个公共点的两平面重合或交于一条直...

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      Besides foot exercise, it is good to pull one's ears. Pulling the ear 20 times is a good way to reduce
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[ ]
A. Curing the disease with medicine.
B. Using the equipment to correct the way children read and sit.
C. Starting with the exercise on one's feet.
D. Taking showers very often.
2. The undeline word "tightly" means ______ in Chinese.
[ ]
A. 松地
B. 紧地
C. 长的
D. 短的
3. Fom the passage we know ______ aren't often suffeing from short-sightedness.
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A. people taking the medicine
B. people using the equipment
C. people wearing tight socks
D. people performing ballet
4. Rope skipping can help one ______.
[ ]
A. grow taller
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题型:解答题

为了研究小白鼠对肺结核杆菌发生传染和免疫,同学们做了以下实验.其方法步骤如下表:

方法与现象
步骤一取六只小白鼠做实验;平均分成甲、乙两组
步骤二将结核杆菌注入小白鼠体内将加热杀死的结核杆菌注入小白鼠体内
现象小白鼠死亡小白鼠存活
回答以下问题:

(1)在步骤一中,六只小白鼠的大小、健康状况要一样,其原因是在对照实验中,除了实验变量不同外,______都要相同.

(2)甲组实验中小白鼠死亡,说明甲组小白鼠感染了______,患了肺结核.

(3)乙组实验中小白鼠产生了抵抗结核杆菌的能力,这种免疫类型为______.

(4)若将流感病毒注入乙组的小白鼠体内,则乙组小白鼠会患流感.这证明了不同的病菌和病毒对应的______不同.

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