The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the ()
A. expansion of the combustion gases
B. exhaust and intake valves just closing
C. maximum compression is just being attained
D. fuel injection occurring at that point and combustion begi
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城市轨道交通运输企业驾驶员、列车检修人员、线路检修员、特种设备检修人员同属轨道运营关键性岗位考评时应相关管理制度和上述人员的资格证书。
A. 正确
B. 错误
Part封装中可以包含多少个PCB封装()。
A. 不限
B. 3个
C. 4个
能为文收责于薛者乎?(《冯谖客孟尝君>)句中“责”是什么意思?