在有信号时调节阀开，在无信号时调节阀关，则此阀为气闭阀。
参考答案：错
张村到李村的图上距离是6.5厘米，实际距离是1300米，求这副图的比例尺．
How are you going to ______ so many difficulties? [ ]
A. deal with
B. do with
C. deal by
D. do up
