工区根据生产计划及安排对拌和站提出()。
A.《混凝土生产记录表》;
B.《混凝土拌合性能记录表》;
C.《混凝土生产申请单》;
D.《混凝土调整记录表》.
参考答案:C
— You must keep the door _______ when you leave your room.
— But I want to get the fresh air. I think I can keep the window ________ instead.
A.close, opened
B.open, closed
C.closing, open
D.closed, open
四轴如何向前、后、左、右、走?