现场控制站有哪些基本功能?
参考答案:
DCS现场控制站的基本功能包括反馈控制、逻辑控制、顺序控制、批量控制、数据采集与处理和数据通信等功能。
MHc-Ⅰ类分子主要分布于 ()
A.红细胞
B.白细胞
C.淋巴细胞
D.巨噬细胞
E.有核细胞
—The light in his office is still on. Do you know ?
—In order to prepare for tomorrow’s meeting.
A.if he works hard
B.why he stays up so late
C.that he is so busy
D.when he will stop working