在铁水中那种元素的发热能力最大()
A、碳
B、硅
C、磷
D、铁
参考答案:B
"Look! There's a notice on the wall," Mary said, _____ to it.[ ]
A. pointing
B. pointed
C. point
D. points
由副溶血性弧菌中毒食物为
A.肉类
B.海产品
C.蔬菜类
D.菌类
E.谷类