系统误差和随机误差均可采用一定的方法消除或加以改正。

题型:判断题

问题:

系统误差和随机误差均可采用一定的方法消除或加以改正。

考点:测量放线工初级测量放线工初级
题型:判断题

如图为元素周期表的一部分.表中所列的字母分别代表某一元素.

(1)1molA与D的氢化物完全反应产生的气体在标准状况下的体积为______.

(2)写出B、C、D氢化物的稳定性由强到弱为______.

(3)表中的另一种金属元素(未标出)的单质G,可以发生如下图所示转化

其中化合物M是一种白色胶状沉淀,则M的化学式为______;

K的溶液与过量B的某种氧化物反应的离子方程式为______.

题型:判断题

阅读理解

     Vacations are meant for the entire family-which means a vacation destination should offer a whole

range of attractions and features that every member of the family should enjoy.Many families would say

that the perfect family destination does not exist.After all,what kind of destination offers that much

diversity?However,Gold Coast in Queensland,Australia may be the closest place you can ever find that fits

the bill of the perfect spot for families of every size,with diverse interests.

     For one thing,the city of Queensland is known for its amazing beaches.While not as popular as the

beaches in Spain or the Caribbean,Australian beaches still do rank among the best in the world.The beach

es here can prove that.If there are worldclass beaches,it could only mean worldclass accommodations and

amenities(设施).In turn,this means everyone in a family can easily  enjoy  the beach,as well as a number

of water sports and activities in a safe environment.This is especially important for foreigners,who may not

be so confident of the security and overall atmosphere in other countries.

     As for young ones,Gold Coast offers an amazing range of theme parks-the range is so great,in fact,that

it's amazing how they all exist within the same city.Theme parks include Sea World,the Warner Brothers

Movie World,among several others! What could kids ask for?It's already as if it is a wonderland.And

adults will surely enjoy the bustling night life in the city,particularly the one in Surfers Paradise.Here,adults

can also enjoy the city's famed shopping district in the Cavill Avenue.The Cavill Mall,in particular,is really a

destination one should visit ;it is filled with the best shops from all over the world.

     Needless to say,Gold Coast has everything for everyone-which is why families should choose this

charming Queensland City the next time they go on a family vacation.Family vacation should be about

family enjoyment,and it really provides that in excess!

1. This text is written for the purpose of ________.

A. attracting readers to take their vocations in Queensland City

B. explaining where visitors should take their vacations

C. telling us where we can find a vacation destination for whole families

D. showing us where children would like to spend their vocations

2. Generally speaking,destinations for whole families are difficult to find because ________.

A. there are few places which can satisfy children nowadays

B. most people nowadays don't know how to please their children

C. different family members have different taste of entertainment

D. now visitors are difficult to please due to  their high demand

3. The writer suggests the city of Queensland to readers because________.

A. it has the most beautiful beaches over the world

B. it provides the firstclass accommodations and amenities

C. it offers an amazing range of theme parks in the same city

D. it can satisfy both children and adults at the same time

4. While traveling abroad,what visitors are most concerned about is ________.

A. the traveling cost

B. the security of traveling

C. the accommodation of destinations

D. the theme parks of the destination

题型:判断题

我国现行的《采暖通风与空气调节设计规范》(GB50019-2003)规定:供暖室外温度,应采用历年平均不保证()的日平均温度。

A.5天

B.10天

C.15天

D.7天

题型:判断题

()肌纤维的结构和功能根据其代谢方式的不同可分为:红肌纤维和白肌纤维。

A、禽类

B、畜类

C、鸡类

D、鸭类

题型:判断题

选用水泥时,水泥标号应比砼设计标号()为宜。

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