多项选择题

铸件的最小壁厚主要取决于( )。 A. 浇注条件 B. 铸件的凝固方式 C. 合金的种类 D. 铸件的尺寸

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不定项选择

A.正确
B.错误

单项选择题

we are going to have a singing party tonight. Would

A.I’m afraid not, because I have to go to an important meeting.
B.Of course not. I have no idea.
C.No, I can’t.
D.That’s all set.