水泥水化反应过程中( )。
A．吸收大量热 B．产生大量二氧化碳C．产生大量热 D．不会产生热
参考答案：C
Excuse me, can you tell me_____?[ ]
A. why was the train .late
B. why the train was late
C. why is the train late
D. why the train is late
鼻中隔小穿孔直径应小于（）。
A.1mm
B.2mm
C.5mm
D.1cm
E.2cm
