A:if were they pleased
B:if they are pleased
C:if are they pleased
D:if they were pleased
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地图上量的两地之间直线距离为3厘米,图上比例尺为1:10 000 000,求两地之间实际距离是多少( )
弗兰西斯培根说:“这三种东西改变了整个世界的面貌和状态,第一种是在文字上,第二种是在战争上,第三种是在航海上。”这里的“第二种”指( )