导线的选择要满足机械强度、导线的安全载流量和允许电压损失三方面的要求。

题型:判断题

问题:

导线的选择要满足机械强度、导线的安全载流量和允许电压损失三方面的要求。

考点:电工特种作业操作证电工上岗证电工上岗证题库
题型:判断题

某男,50岁,.缺失,5年前曾在诊所行单端固定桥修复,现诉:松动疼痛检查,锤造开面冠,作为单端固定桥的固位体。开面冠边缘与颈缘有间隙。牙龈区红肿,探诊易出血。Ⅰ~Ⅱ度松动,叩(+)。

松动的主要原因()

A.制作不当

B.设计不当

C.固位体与基牙不密合

D.牙龈炎的表现

E.牙髓炎的表现

题型:判断题

完形填空(二)(本题共15小题,满分30分)

阅读下面短文,根据文意,将方框内所给的词或短语的适当形式填入相应的空白处,使短文的意思完整。(每个词只能使用一次)(本题共十小题,每小题2分,满分20分)

We all need a healthy environment, but we produce waste every day and it__小题1:__ our environment. Though we are young, we can still do something to help. In fact, even the simplest _小题2:__activities can make a real difference to the environment. Here are some ideas for you.

Reduce means “use less”. Don’t waste things. This __小题3:__money and reduces pollution and waste going into the environment. Before we buy something new, think ___小题4:____it is really necessary—or maybe the old one will be just as good! When we do buy things, choose local products if __小题5:_____ and try not to buy too many things from abroad.

Reuse means “use again”. Use things for as long as possible. When we buy things, make sure that they __小题6:__ a long time. We should look after them__小题7:_ they will last and we should repair them if we can instead of  throwing them away and buying new ones. Don’t use a paper cup or a paper bag. It’s better to use a china cup and a lunch box because you can use them __小题8:__.

Recycle means “change things into something else”. Although it takes ___小题9:_ to change something into something else, it’s better than throwing things away or burning them. Find out what can be recycled in your_小题10:__ and take part in recycling programmes. We should also buy products made from recycled materials, such as recycled paper, to help save trees.

题型:判断题
设复数z=
3-i
2+i

(1)复数z在复平面内对应的点在第几象限;
(2)若z2+ai+b=1+i,求实数a,b的值.
题型:判断题

在计算聚合物驱提高()大小和吨聚合物增油量时,用归一化的方法,才能准确地计算出某一阶段的聚合物驱增油量。

A、采液量

B、采油量

C、采收率

D、注采比

题型:判断题

箱体零件的划线是立体划线,通常选择箱体的()为第一划线位置。

A.正面位置

B.侧面位置

C.工作位置

D.水平位置

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