活塞式空压机一级气压（）时报警并停机。
A.≥0.15MPa
B.≥0.2MPa
C.≥0.23MPa
D.≥0.25MPa
参考答案：B
To improve the quality of our products, we asked for suggestions _____ had used the products. [ ]
A. whatever
B. who
C. whichever
D. which
《车辆行驶证》是车辆出勤的凭证。经批准动用车辆的行驶证，由（）随车携带。
A.运输部门；指定人员
B.车辆所属分队；分队首长或指定人员交给驾驶员
C.运输部门；驾驶员保管
