气化单元设置流量停车联锁的介质有（）。
A.入炉天然气流量
B.入炉氧气
C.废热锅炉产汽流量
D.碳黑洗涤塔洗涤水流量
参考答案：A, B
一物体由A点自由下落，经过B点到达C点，已知质点经过B点时的速度是到达C点时速度的3/4，BC间距离为7 m，则AC间距离是___________________m(取g="10" m/s2).
—The boss said we had only three days to finish the work.
—Don’t worry.We have already _______ two thirds of it.
A．got down
B．got through
C．given in
D．given away
