石墙要分层砌筑,每层高300~400mm,每层中间隔()m左右砌与墙同宽的拉结石。
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某混凝土拌和物1m3的质量为2400kg,砂粒为34%,拌制1m3拌和物需用含水率3%的湿砂650kg,石子含水率为2%,拌和用水量为145kg,则其水灰比为()。
A. 0.43
B. 0.46
C. 0.5
D. 0.53
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.
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