如圖,在圓盤上旋轉(zhuǎn)指針.
(1)指針從“1”繞點(diǎn)O順時(shí)針旋轉(zhuǎn)45°到
“2”
“2”
.
(2)指針從“2”繞點(diǎn)O順時(shí)針旋轉(zhuǎn)
180
180
°到“6”.
(3)指針從“3”繞點(diǎn)O逆時(shí)針旋轉(zhuǎn)90°到
“1”
“1”
.
(4)指針從“5”繞點(diǎn)O順時(shí)針旋轉(zhuǎn)
180
180
°到“1”.
(5)指針從“1”繞點(diǎn)O逆時(shí)針旋轉(zhuǎn)
90
90
°到“7”.