题目内容

In some diesel engine designs, the injection of cylinder oil is timed to impinge when the

A. is coming upward, cylinder ring belt
B. is going downward, piston ring belt
C. is coming upward, piston ring belt
D. is going downward, cylinder ring belt

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A. 纯棉衣服
B. 皮鞋
C. 口罩
D. 工作手套

A. 专业化
B. 系统化
C. 职业化
D. 成熟化

A. 10%
B. 12%
C. 15%
D. 19.5%

A. 90。脉冲，一个180°复相脉冲
B. 180°反转脉冲，一个90°激发脉冲与一个180°复相脉冲
C. 90°激发脉冲，多个180°复相脉冲
D. 采用小的翻转角脉冲，几个180°脉冲
E. 90°脉冲，几个180。脉冲