问题
不定项选择
关于两个力的合成，下列说法正确的是[ ]
A．合力大小一定大于分力大小
B．合力大小至少大于两分力中的一个分力大小
C．两个分力夹角为锐角时，合力大小一定大于两分力的大小
D．两个分力夹角为钝角时，合力大小一定小于两分力的大小
答案
答案：C
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关于两个力的合成，下列说法正确的是[ ]
A．合力大小一定大于分力大小
B．合力大小至少大于两分力中的一个分力大小
C．两个分力夹角为锐角时，合力大小一定大于两分力的大小
D．两个分力夹角为钝角时，合力大小一定小于两分力的大小
答案：C
(2013·高考陕西卷)To celebrate the end of our exams，my friends and I went to a fast food restaurant.We____hamburgers and Coca Cola at the counter.When our____came，I started walking towards an empty table.By bad luck，my purse strap(带子)got____on a chair and the tray(托盘)that I was holding slipped___my hands and went flying in the air.The tray，and its contents，____on a man who was just about to____a bite of his sandwich.I stared，greatly____，as the drinks soaked(浸湿)his white shirt. Then I___my eyes and prepared myself for his burst of____.Instead，he said“It’s OK”to____me before he disappeared into the washroom. Still shaky and unsure____to do next，my friends and I went to a table and sat there，trying our best to look____.A moment later，the man came out of the washroom and___our table.My heart almost stopped____.I thought he was going to ask for my father’s__and call him. To my surprise，he merely smiled at us，handed us some cash and said，“____yourself new hamburgers.”He then walked____without even finishing his food. He could have made what was already an uncomfortable situation worse，____he chose a different way and gave us a reason to believe that there is still____in this world.I’ll never____his actions.
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