钟表在5点15分时,它的分针与时针所成的角是______度(近似).
钟表在5点15分时,它的分针与时针所成的角是2×30+15×0.5=67.5°.
故答案为67.5.
There are so many kinds of pens in the shop ,I can’t decide ______.
A.when to buy
B.where to buy
C.what to buy
D.which to buy
交、直流配电设备更新周期()年。
A.15
B.10
C.5
D.8