A:when was it that
B:that it was whe
C:where it was that
D:it was where that
若sin(cosθ)cos(sinθ)<0,则θ的取值范围 ____
用如图所示的水壶提水时,手应提在水壶把手的____处(选填“A”或“B”,下同);把水壶里的水灌到保温瓶中去时,手应提在水壶把手的____处。出现这样的差别主要是因为力的三要素中力的____影响力的____所导致的。