假定梁下设置通长的现浇钢筋混凝图圈梁，如剖面B-B所示；圈梁截面尺寸为 240mm×180mm，混凝土强度等级为C20。试问，梁下(圈梁底)砌体的局部受压承载力 (kN)与下列()项数值最为接近。
A. 192
B. 207
C. 223
D. 246
查看答案
The first paragraph tells us that a new product is______.
A. not easily accepted by the public
B. often inferior to old ones at first
C. often more expensive than old ones
D. usually introduced to satisfy different tastes
【B4】
A. do not
B. had not
C. did
D. have
One of the driving forces behind the recent prevalence of customer innovation is
A. the evolution of sporting equipment.
B. the development of Internet technology.
C. the motivation of making money.
D. people's advocacy of innovation.
The word "rapport" (Sentence 1, Paragraph 1) probably means______.
A. belief
B. harmony
C. relationship
D. connection
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