搜题请搜索小程序“爱下问搜题”
问题
判断题
人造关节所用的材料有陶瓷。
答案
参考答案：错
选择题
She said she ___ to a restaurant and enjoyed herself.
A. has gone
B. had gone
C. has been
D. had been
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单项选择题
浓度为20%的糖水60克，要将它变成浓度为40%的糖水，要加糖多少克( )
A．12
B．15
C．20
D．24
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