搜题请搜索小程序“爱下问搜题”
问题
单项选择题
磨耗最常发生在牙冠的哪部分
A．舌面、牙合面和邻面
B．唇面、耠面和邻面
C．切嵴、舌面和邻面
D．牙合面、切嵴和邻面
E．牙合面、轴面和邻面
答案
参考答案：
D
填空题
化简
(
a
2
3
b
1
2
)(-3
a
1
2
b
1
3
)÷(
1
3
a
1
6
b
5
6
)
的结果是 ______．
查看答案
选择题
This is one of the best films ______ this year.
A. which has been shown
B. that have been shown
C. that have shown
D. have been shown
查看答案
