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问题 填空题

铝的密度是2.7×103kg/m3，它的物理意义是_____________________________。

答案

体积为1m3的铝，质量为2.7×103kg

补全对话，情景问答
根据对话内容，用方框中所给词的适当形式填空。
Family,  too,   do,   five,  and,  farmer,  like
( At an English corner)
A: Hello! I'm Peter.
B: Hello! I'm Liu Dong. Nice to meet you.
A: Nice to meet you, 1__________
B: I'm from China. Where're you from?
A: I'm from America. How many people are there in your 2__________?
B: There' re 3__________. They' re my grandpa, grandma, father, mother and I.
A: What do your parents 4__________?
B: My father's a teacher 5__________ my mother works in a bookstore.
A: Does your father 6__________ his job?
B: Sure. He likes teaching very much. What about your parents?
A: Both of them are 7__________. They have a big farm.
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单项选择题 案例分析题

女，8岁，因前牙反就诊。口内观牙齿数目正常，排列整齐，上下切牙反，反覆盖浅，反覆中度，切牙可后退至对刃，磨牙近中。口外观矢状向轻度凹面型，垂直向为均角面型。

可能的治疗方案可以排除（）.

A.咬撬法

B.颏兜

C.上颌前牵引

D.下颌联冠式斜面导板

E.上颌垫式活动矫正器
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