题目内容

视网膜中主要的光敏细胞是光感受器。所有其他细胞仅通过与光感受器的直接或间接的突触联系受到光的影响。

A. 正确
B. 错误

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监管警戒设施主要包括哪些？

电厂燃用的一般原煤发热量为（）。

A. 12—15MJ/kg
B. 15--23MJ/kg
C. 20--23MJ/kg
D. 15—18MJ/kg

（）means the person on board the ship, accountable to the master, designated by the Company as responsible for the security of the ship, including implementation and maintenance of the ship security plan and for liaison with the company security officer and port facility security officers.

A. Ship security officer
B. Company security officer
C. Port facility security officer
D. PSC officer

写出完成下列功能的DOS命令，其中DOS的所有外部命令在C：\DOS目录下。将C盘一级子目录Q2下的文件L1.COM以新文件名FF.EXE复制到B盘当前目录下。