问题
单项选择题 A1/A2型题
关于卡环连接体的作用和弯制方法，下列各项错误的是（）
A.连接体将卡环与基托连接成一整体
B.连接体具有加强义齿的作用
C.连接体应分布合理
D.卡环的连接体应互相重叠，加强义齿抗折能力
E.卡环连接体与支托连接体平行，然后横跨，形成网状结构
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
关于卡环连接体的作用和弯制方法，下列各项错误的是（）
A.连接体将卡环与基托连接成一整体
B.连接体具有加强义齿的作用
C.连接体应分布合理
D.卡环的连接体应互相重叠，加强义齿抗折能力
E.卡环连接体与支托连接体平行，然后横跨，形成网状结构
参考答案：D
| 完形填空。 | ||||
| The world of the out-of-doors is full of secrets. And they are so interesting that quite a lot of people are busy studying them. All round us are birds, animals, trees and flowers. The fact about how they 1 and grow are as interesting as anything could be. Do you know that one of the great presidents of the USA spent hours and hours 2 birds? A doctor who lives near New York City was so 3 in insects that he began to 4 them. Now he has more than one thousand different kinds of insects. Come then with me, and I will help you find some of nature' secrets. Let us go 5 through the woods and fields. Here we shall find how a rabbit tells the other rabbits that there is danger. We shall 6 a mother bear and her young ones as they look for 7 and get ready for winter sleep. We shall watch bees dancing in the air to let other bees know 8 they can find food. I will show you many other interesting things, but the best thing that I can 9 you is to keep your eyes and ears 10 when you go out of doors. Nature tells these secrets only to people who look and listen carefully. | ||||
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的加速度向右匀加速运动时，小球对绳的拉力和对斜面的压力又分别是多少？（取g= 10 m/s2） 