拉紧装置调节余量不少于调节全行程的（）。
A.1/4
B.1/3
C.1/2
D.1/5
参考答案：B
Which of the following tool is used for scope verification
A) Performance measurement.B) Scope change control system.C) Inspection.D) Earned value.
喷油泵齿条打不开会造成双燃料（）不启动。
