对于四冲程发动机，如果采用电容放电式点火系统，时间常数应满足（ ）。

A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/c582e9f0-ac01-426d-91a4-d6cca56e13a3.jpg"title="1374569389613.jpg" alt="1374569389613.jpg"/>&nbsp;

B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/2ef84e3b-76db-4bc7-b084-bfa23f98b558.jpg"title="1374569409144.jpg" alt="1374569409144.jpg"/>

C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/e4c9469e-377c-4e1d-b940-595fcb030897.jpg"title="1374569421644.jpg" alt="1374569421644.jpg"/>

D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/771e4256-3183-45b6-9e7a-3efb74a6dfc3.jpg"title="1374569434066.jpg" alt="1374569434066.jpg"/>