劳动者（工人）是施工过程中（）的因素。
参考答案：最基本
琼脂印模材料的凝胶温度不能低于（）℃
A.37
B.63
C.45
D.都不是
—I rang you at about nine，but there was no reply．
—Oh，that was probably I was seeing the doctor．
A．why
B．when
C．what
D．that
