Gasoline tanks should be filled（）.

A.to the top to expel all vapors from the tanks

B.to the top so the operator is certain how much fuel he has aboard

C.with only sufficient fuel for the planned trip so excess gasoline is not carried

D.to near the top with some space allowed for gasoline expansion

决定每分钟肺泡通气量的因素是

A．余气量的多少

B．潮气量的大小

C．肺活量

D．呼吸频率、潮气量与无效腔的大小

E．呼吸频率与无效腔的大小