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【单选题】
圆台的 4cm , 上下两个底面半径分别为 3cm 和 6cm , 则圆台的侧面积是( ) cm2A.
36 π
B.
90 π
C.
45 π
D.
77 π
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【单选题】After resolving the trouble of main power supply, main switch of emergency generator should ________, if the power supply is refreshed.
A.
be switched off by the duty officer
B.
be switched on by the duty officer
C.
be switched off automatically
D.
be switched on automatically
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