喷射混凝土与岩石的粘结力,对Ⅲ类围岩不低于()MPa。
A. 0.3
B. 0.5
C. 0.8
D. 1.0
Steam fog is most likely to occur on the Mississippi and Ohio Rivers in().
A. spring,around late evening
B. spring,around early evening
C. fall,around early morning
D. fall,around midday
通过观测婴幼儿身高增长的趋势,可了解儿童近期营养状况。
A. 正确
B. 错误