According to Dr. Nell, what is the most noticeable effect of smaller families?
A. There is less mixing of ages in smaller families.
B. Children can get more affection from their parents.
Children can live in a more loving environment.
D. Children are able to enjoy better living condition.
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单向出入的停车场出入口,出入口宽度不得小于()m。
A. 7
B. 5
C. 6
D. 4.8
石墙的灰缝应在最后用()水泥砂浆统一勾缝。
A. 0.000700231
B. 0.0423611
C. 0.0430556
D. 0.04375
采用后张法施工,如设计无规定,张拉预应力筋时,要求混凝土的强度至少要达到设计规定的混凝土立方体抗压强度标准值的()。
A. 0.85
B. 0.8
C. 0.75
D. 0.7
石子与砂子的分界线为粒径()mm。
A. 4.5
B. 4.75
C. 5
D. 6