易引起沙门氏菌属食物中毒的食物是肉类品。( )
参考答案：对
A great ______ of foreign guests come to our school for a visit every year.
[ ]
A. deal
B. number
C. many
D. amount
天然大理石板材的干燥压缩强度不小于（）MPa。
A.20.0
B.30.0
C.40.0
D.50.0
