对细胞全能性的表述正确的是[ ]

A．非离体植物细胞能够表现全能性

B．动物细胞融合标志着动物细胞全能性的实现

C．花粉可培育成单倍体，是细胞全能性的体现

D．单克隆抗体的制备原理依据是细胞的全能性

A crew member reports that the high-pressure alarm light of a low-pressure CO₂ fixed fire extinguishing system is illuminated. The most probable cause of this condition would be that（）.

A.an air leak has developed in the tank

B.the tank cooling system has malfunctioned

C.the pilot cylinder discharge valve is leaking

D.an excessive amount of insulation has been installed on the tank and piping