关于可选用单端固定义齿修复，叙述错误的是（）。 A.基牙有良好的支持固位条件 B.缺

关于妊娠期子宫的变化有（）。

A.子宫峡部逐渐被拉长变薄，开成子宫下段

B.子宫出现不规则的无痛性收缩

C.子宫血流量较非孕时增加4~6倍

D.子宫体明显增大变软

E.妊娠晚期子宫多呈不同程度的右旋

阅读短文，根据短文内容判断正误，正确的填A，错误的填B。

     American doctors say that mothers who smoke before their babies are born may slow the growth of their

babies' lungs. They say reduced lung growth could cause the babies to suffer breathing problems and lung

diseases later in life. Doctors in Boston, Massachusetts studied 1,100 children. The mothers of some of the

children smoked, the other mothers did not. Doctors found that the lungs of the children whose mothers

smoked were 8% less developed than the lungs of the children whose mothers did not smoke, and that the

children whose mothers smoked developed 20% more cold and breathing diseases than other children later

in life.

     Another recent study found that children had a greater chance of developing lung cancer if their mothers

smoked. The study also showed that the danger of lung cancer increased only for sons and not for daughters,

and that the father's smoking did not affect a child's chance of developing lung cancer.

( )1. Doctors in Boston studied 1,100 children to look into the effect mother's smoking had on their children.

( )2. Mothers who smoked did not reduce the growth of their children's lungs.

( )3. The lungs of the children whose mothers smoked were 8% less developed than those of other children.

( )4. Suppose John's father was a heavy smoker, so was Mary's mother. According to the text, neither John

            nor Mary has the chance to develop lung cancer.

( )5. The text is to warn us of the danger of smoking before children.

（）在平行于外花键轴线的投影面的视图中，工作长度终止线用绘制，小径尾部与轴线成30°的斜线。

A.细实线

B.粗实线

C.点画线

D.虚线

-种行为是否构成火灾隐患，主要从以下方面去判断（）

A.是否增加了火灾危险性

B.是否造成了实际损失

C.发生火灾时是否会增加危害程度

D.是否影响灭火救援工作

E.是否影响财产安全