Question

鐘面上，分針轉(zhuǎn)動(dòng)360度，相應(yīng)地時(shí)針轉(zhuǎn)動(dòng)（　�。┒龋�

A．360

B．180

C．60

D．30

E．20

   

Answer 1

分析：鐘面上分針轉(zhuǎn)動(dòng)一周是360度，轉(zhuǎn)動(dòng)了60個(gè)格，時(shí)針轉(zhuǎn)動(dòng)5個(gè)格，每個(gè)格對(duì)應(yīng)的圓心角是360°÷60=6°．據(jù)此解答．

解答：解：360°÷60×5，
=6°×5，
=30°．
答：時(shí)針轉(zhuǎn)動(dòng)了30°．
故選：D．

點(diǎn)評(píng)：本題的關(guān)鍵是求出時(shí)針走的格子數(shù)，再根據(jù)每個(gè)格子對(duì)應(yīng)的圓心角是360°÷60進(jìn)行計(jì)算．