下图中，能正确反映酵母菌在不同环境温度下发酵时，单位时间内产酒量变化的曲线是 [ ]
A．
B．
C．
D．
C
自立表现为独立自主的做出决定，不能被他人的意见所左右。
Which statement is TRUE concerning gasoline vapors on board a vessel（）.
A.They are heavier than air and will settle in the lowest part of the vessel
B.They are lighter than air and will settle in the highest part of the vessel
C.They should be vented into the engine to improve combustion
D.They should be vented into the wheelhouse
