如图表示一定条件下，A、B、C三种气体物质的量浓度随时间变化的情形． （1）该反

用括号内所给单词的适当形式填空。

1. I always worry about my English exams. But _____ (lucky) I did OK this time.

2. Look! The dog is still______ (live). Let's ask a vet (兽医) for help to save it.

3. Did you have fun ______ (learn) English in the English club last week?

4. Li Yundi and Lang Lang are both famous _______ (piano) in the world.

5. They think the cinema has the _______ (friendly) service in town.

关于胃肠癌的超声特征，不正确的是（）

A.病变区胃肠壁增厚

B.病变区显示为假肾征的强回声团块

C.病变处胃腔及肠腔不同程度的狭窄甚至变形

D.病变部胃肠壁僵硬，蠕动波减缓或消失

E.可见淋巴回流区域淋巴结肿大或脏器转移征象

物体的机械能为26J，势能为7J，则其动能为______ J．

临床上被称为自凝塑料的是

A．高温化学固化的塑料

B．室温化学固化的塑料

C．高温物理固化的塑料

D．室温物理固化的塑料

E．超低温化学固化的塑料