下列说法正确的是[ ]

A．脂质中的胆固醇是对生物体有害的物质

B．控制细胞器进行物质合成、能量转换等指令，主要是通过核孔从细胞核到达细胞质的

C．拍摄洋葱鳞片叶表皮细胞的显微照片就是建构了细胞的物理模型

D．小分子物质都能通过细胞膜，大分子物质则不能

For each of these targeted markets, the technology transfer brokers have identified several needs and have performed matching research for space technology or know-how which could potentially respond to these needs.

A．facilities

B．devices

C．agents

D．pallids