箱梁的主要优点有( )
A.截面抗扭刚度大
B.适应具有正负弯矩的结构
C.受弯时截面均匀受力(压、拉)
D.适用于悬臂.顶推施工
参考答案:A,B,D
下列疾病患者外周血涂片中不会见到有核红细胞的是()。
A.红白血病
B.再生障碍性贫血
C.骨髓纤维化
D.骨髓转移癌
E.自身免疫性溶血性贫血
At the meeting Mr. King didn't say a word from beginning to end, ______? [ ]
A. didn't Mr. King
B. did he
C. did Mr. King
D. didn't he