零点偏置原则之一:来自同组指令中的两个偏置尺寸,()偏置尺寸有效。A、任何一个; B

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问题:

零点偏置原则之一:来自同组指令中的两个偏置尺寸,()偏置尺寸有效。

A、任何一个;

B、没有一个;

C、最后调用;

D、最先调用;

考点:铣工考试数控铣工考试数控铣工考试题库
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实体联系模型是一种常用的高级 【4】 模型,而 【5】 是实体联系模型中的核心。

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阅读短文,根据其内容回答问题。

     Five million people visit Grand Canyon in the US every year. For the purpose of helping protect Grand

Canyon for your fellow visitors and future generations, please follow the guidelines below.

     Camping To protect the park, camping is allowed only within permitted camp-grounds. Permits are

required for ovemight camping at the North Rim. Advance book- ing can be received by mail. Please write:

Information Center, P.O. Box 129, Crand Canyon, AZ 86023.

     Fires Because of the extreme fire danger, campfires are not allowed except at Mather and Desert View

campgrounds. Collection of firewood is not allowed either.

     Hiking Please stay on permitted paths. Otherwise you may destroy desert plants. Pack out what you

pack in, so you leave no signs of your visit. It is important to keep in mind that you are in a national park

where wildlife exists.

     Weather The weather at Grand Canyon can change very quickly. With so much rock, lightning (闪电)

causes a particular danger during sudden summer storms. These storms also frequently bring floods inside

valleys, a danger to hikers. Watch the skies and check daily weather reports.

     Wildlife Do not feed park wildlife. There have been a few cases at Grand Canyon National Park where

deer were purposely shot because there are plastic bags that left them sick and weak. Hungry deer can be

danger and have kicked and bitten visitors at Grand Canyon. Some other animals will also beg and bite. For

your own safety and the well-being of the animals, please do not feed wildlife, no matter how gentle they

may appear.

1. Do five million people visit Grand Canyon in the US every year?

    ____________________________________________________________________

2. Why aren't campfires allowed except at Mather and Desert View campgrounds? 

    ____________________________________________________________________

3. How is the weather at Grand Canyon? 

    ____________________________________________________________________

4. How many guidelines are there in this passage? 

    ____________________________________________________________________

5. What is the main purpose of the passage? 

    ____________________________________________________________________

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除去下列物质中的少量杂质,所选试剂及操作都正确的是

序号物质杂质试剂操作
ACO2H2O浓硫酸洗气
BFeCl2溶液CuCl2过量铁粉结晶
C铁粉氧化铁适量盐酸蒸发
D铜粉炭粉过量水溶解

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某年某月某日,某铁矿发生火灾事故,由于该矿和临矿互通,火灾共涉及5个铁矿,造成上百人被困井下。经多方抢救,遇难矿工人数仍达70人。随即成立了国务院事故调查组,调查组由国家安全生产监督管理总局、监察部、全国总工会、国土资源部、省人民政府联合组成,分为综合、技术、管理三个组。国务院事故调查组经初步调查,认定事故发生的直接原因是:该矿维修工在井筒内使用电焊,焊割下的高温金属残块及焊渣掉落在井壁用于充填护帮的荆笆上,造成长时间引燃,最后引燃井筒周围的荆笆及木支护等可燃物,引发井下火灾。5家矿山越界开采,造成各矿井下巷道贯通,风流紊乱,火灾烟气蔓延,各矿均未按要求设置井下作业人员逃生的安全通道,直接导致了事故的升级和扩大。

《安全生产法》规定:生产经营单位发生生产安全事故造成人员伤亡、他人财产损失的,应当依法承担赔偿责任,拒不承担或者其负责人逃匿的,由( )依法强制执行。

A.事故调查组

B.当地政府

C.人民法院

D.当地公安部门

E.安全生产监督管理局执法大队

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