消化性溃疡活动时，下列说法错误的是（）. A.疼痛可放射至背部 B.疼痛性质不一，常

We are learning English, but how can we learn English well? A student can know a lot about English, but maybe he can not speak English.

If you want to know how to swim, you must get into the river. And if you want to be a football player, you must play football. So , you see, you can learn English only by using it. You listen to your teacher carefully in class. You must read your lessons every day. You must speak English to your English teacher and classmates and also you must write in English. Then one day, you may find your English very good.

小题1:You know a lot about English but maybe you ______.

A．can’t speak it

B．can study it

C．can’t study it

D．can’t use it小题2:You must get into the river ______.

A．to play with water

B．to go boating

C．to learn how to swim

D．to catch a fish小题3:Do you want to be a football player? Please____.

A．put your football away

B．buy a good football

C．play football

D．watch others play football小题4:According to the passage，how can we learn English well ?

A．We must have a good English book.

B．We must have a good English teacher.

C．We must see more English films.

D．We must use it often.小题5: Who can you speak English to in your class?

A．Only my classmates.

B．My English teacher and classmates.

C．My father and mother.

D．All my friends.

患者，男，16岁，5个月前无明显诱因于面部、上胸背部出现丘疹、脓疱、结节、囊肿，有触痛，时轻时重，逐渐增多，部分皮疹有破溃、结痂，形成散在瘢痕。发病以来一般情况可，睡眠、饮食及大小便无特殊。既往无药物过敏史、无服用糖皮质激素等药物史，也无焦油、沥青、卤代氢类化合物接触史，否认家族中有类似患者。

按照Pillsbury分类法，该患者最可能属于几度损害（）。

A.Ⅰ度（轻度）损害

B.Ⅱ度（中等度）损害

C.Ⅲ度（重度）损害

D.Ⅳ度（严重度）损害

E.无法分类

试述肝细胞的三个不同连接面，各有何特点。

低比转数的离心泵，流道较窄，（）较大，效率较低。

A、轴承、轴封磨擦损失；

B、圆盘磨擦损失；

C、沿程磨擦损失。

以下哪项不是序列拔牙的适应证（）

A.严重的牙列拥挤

B.无恒牙胚缺失

C.双颌前突的患儿

D.肌功能基本正常

E.无明显牙颌面关系异常