对石质基底高程应满足的容许误差为（）
A.+50mm，-200mm
B.±50mm
C.±200mm
D.+200mm，-50mm
参考答案：A
Why don't you to be Danny's friend? [ ]
A. pretend
B. pretended
C. was pretended
D. is pretended.
“一日不见如三秋兮”是（）中的句子表达了男女之间缠绵深挚的相思之情。
