钻孔灌注桩基础孔径允许偏差为（）。
A.+100mm，-50mm
B.±50mm
C.+50mm
D.-50mm
参考答案：D
I’m writing to tell you that my family ____ wild animals in Kenya next Sunday.
A．is seeing
B．will be seeing
C．have seen
D．will have seen
引起副溶血性弧菌食物中毒的中毒食品主要是
A．肉类食品B．海产品C．乳类及其制品D．家庭自制发酵食品E．糕点类食品
