砖墙上不得留脚手眼的部位包括()。
A.空斗墙、半砖墙和砖柱
B.宽度小于1m的窗间墙
C.梁或梁垫下及其左右各500mm范围内
D.距洞口240mm处
参考答案:A, B, C
The company designed a new car last month and about 500 cars of this type _____ in the factory next month.[ ]
A. were produced
B. will produce
C. have been produced
D. will be produced
扁桃体的生发中心内有()。
A.T细胞
B.B细胞
C.吞噬细胞
D.IgG
E.IgA