Look! There _______ so many people _________here. Do you know what has happened?
A. is, standing
B. are, are standing
C. are, standing
D. is, is standing
查看答案
SMA面层的结构特点是“三多一少”,具体指的是粗集料多、矿粉多、沥青多、细集料少。( )
A. 对
B. 错
SMA结构是典型的悬浮密实结构。( )
A. 对
B. 错
SMA路面比较适用于高速公路、一级公路的抗滑表层。( )
A. 对
B. 错
SMA面层厚度一般为3.5~4cm。( )
A. 对
B. 错
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