下列属于低水化热水泥的有()。
A.矿渣水泥
B.大坝水泥
C.高标号水泥
D.粉煤灰水泥
参考答案:A, B, D
Have you sent thank-you notes to the relatives from _ _ you received gifts? [ ]
A. which
B. them
C. that
D. whom
绘制中国四大地理分区示意图,突出分界线,并简述其在地理教学中的教学意义。