A:sinx
B:-sinx
C:cosx
D:-cosx
——I want to put up the picture on the wall. Would you mind helping me with it?—— ______. With pleasure.
龙卷风是一种灾害性天气。小强同学根据天气预报将龙卷风始发地M及运动方向在经纬网地图中作了标注。龙卷风移动的方向是( )。
完成下列填空: