气硬性胶凝材料只适用于( )环境。
A.潮湿
B.地下
C.水中
D.地上
参考答案:D
It’s _______ you do today that will make a difference in your life tomorrow.
A.what
B.that
C.how
D.which
A.255.255.255.0
B.255.255.0.0
C.255.0.0.0
D.0.0.0.0