When do you think ______ start the new attack?
A. they will
B. will they
C. they can
D. can they
George applied for the position three times ______ he finally got it.
A. before
B. until
C. when
D. after
下面关于构造柱的作用,正确的是()。①提高砖砌体房屋的抗剪强度;②对砖砌体起了约束作用,使砌体变形能力有较大提高;③增加砌体房屋的刚度;④提高砌体结构中墙柱高厚比的限值
A. ① ② ④
B. ③ ④
C. ① ③
D. ① ②
砌体结构的受压承载力系数φ()
A. 随相对偏心距的增大而增大
B. 随高厚比的增大而增大
C. 与高厚比的变化无关
D. 随高厚比的增大而减小