油机发电机组正常停机时,应先切断(),空载运行()分钟后再停。
参考答案:负荷;3-5
"His face is round " means _____. [ ]
A. His face is not round.
B. He has a round face.
C. His face likes round
D. He have a round face.
胃溃疡与胃癌的区别,胃癌表现为
A.胃癌溃疡形状不规则,较小
B.底凸凹不平,苔污秽
C.边缘呈结节状起
D.周围皱襞中断
E.胃壁僵硬,蠕动减弱