根据现场单桩竖向静荷载试验所提供的承载力数值是( )。
A.极限值
B.标准值
C.设计值
D.基本值
参考答案:A
—Joan,what ________ in your hand?
—Look! It's a birthday gift for my grandma.[ ]
A. had you held
B. are you holding
C. do you hold
D. will you hold
水泥生产巡检工的职业环境包括()、()、()和()