C & F price 成本加运费价C & K line 阻流及压井管线C to C 中心距C to E 中心到端面的距离C 常C

“ At the end of your life, you will never regret not having passed one more test, not winning one more verdict or not closing one more deal. You will regret time not spent with a husband, a friend, a child, or a parent. ” ― Barbara Bush