问题
问答题 简答题
截止阀的特点是什么？
答案
参考答案：
（1）结构简单、制造方便、密封性能好、使用寿命长。
（2）启闭快，关门高度小；关闭时，克服力矩大，通径受限制。
（3）流动阻力大、介质受方向限制。
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截止阀的特点是什么？
参考答案：
（1）结构简单、制造方便、密封性能好、使用寿命长。
（2）启闭快，关门高度小；关闭时，克服力矩大，通径受限制。
（3）流动阻力大、介质受方向限制。
On Sunday morning, I usually get up very late. I wash my face and then go out to do morning exercises. It is about 8.20 a. m. After I eat my __1__, I often go to a shopping centre __2__ my mother. The shopping centre is __3__ our home, so we walk there. It takes us about 20 minutes to get there on foot. The shopping centre has a good __4__. It is called "新世纪购物中心" in Chinese. It doesn’t have an __5__ name. Can you help to put it into English? It is new and big. __6__ many things there, such as (诸如) TVs, fridges, bikes, computers, clothes, books, food and drinks. There are many people there. There are men and women, old and __7__. Parents must __8__ their children. The shopping centre is so big. Young children may get lost (迷失) in it. __9__ do many people come here to buy things? Do you know? Let me tell you. The things there are usually good and __10__. The workers there are always nice and friendly. If(如果) you come to my home, I can take you there and have a look.
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