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【简答题】
R 为圆弧半径。若圆心角≤ 180 °,则 R 为 _____ 值;若 180 °<圆心角< 360 °,则 R 为 _____ 值。
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举一反三
【单选题】Envy and jealousy of other people and their lives become ______ once you start believing in yourself.
A.
superficial
B.
superfluous
C.
superstitious
D.
supernatural
【简答题】—_________ he start at once or wait for a while? —Let him start at once. A．Will B．Would C．Does D．Shall
【单选题】—_____ he start at once or wait for a while? —Let him start at once.
A.
Will
B.
Would
C.
Does
D.
Shall