煤粉细度R90越大,即煤粉越粗,着火温度()。
A.越高
B.越低
C.不变
D.不确定
参考答案:A
Tom realized that he ________ his physics book at home when he reached school.
A.left
B.had left
C.was leaving
D.leaves
教师的平均工资水平应当()国家公务员的平均工资水平,并逐步提高。