关于发动机进气整流锥的错误说法是（） A.分前、后整流锥两部分_爱下问搜题

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问题单项选择题

关于发动机进气整流锥的错误说法是（）

A.分前、后整流锥两部分

B.对进入发动机的空气进行整流

C.前整流锥上安装配平钉来平衡发动机转子

D.后整流锥上安装配平钉来平衡发动机转子

答案

参考答案：C

单项选择题

与乳腺癌有关的激素受体为（）

A.GR

B.ER、PR

C.TRs

D.GHR

E.AR

完形填空

阅读下面的短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
Geography is an important tool for learning and understanding history. Geography affects history—just look at the changes in world geography over recent years. Governments change, and __ _ countries were born.Many countries no longer have the same names they _ __even five years ago. Climate changes _ ___events such as droughts(干旱) and floods that cause lots of loss of life and the movements of people from one place to another in search of_ __. Environmental changes can change the entire __ __of a community or region.
As with history, children have a natural interest in_ __. Watch a group of children playing in the sand. One child makes streets for his cars, _ __ a second child builds houses along the_ __.A third scoops out a hole and_ ___ the dirt to make a hill, then pours water in the _ __ to make a lake, using sticks for _ __. The children name the streets, and __ __ may even use a watering can to make_ __ that washes away a house. They may not realize it, _ ___these children are learning some core features(核心特征)of geography—how people interact with the Earth, how climate _ __land, and how places _ __each other through the movement of things from one place to another. Turning to maps or globes, When we talk with our children about vacation plans, events ___around the world or historical events, we teach them a great deal about geography. Not only can such activities help our children learn how to use key reference tools,__ _ over time, they help them form their own mental maps of the world, which allows children to better organize and _ ___information about other people, places, times and_ __. Such activities also help our children learn to how to work together in the future.

A．bring about

C．environment