定金合同什么时候成立？
参考答案：只有在交付定金后才成立。
支气管碘油造影，应在大咯血后多少天进行为宜（）
A.3天左右
B.1周左右
C.不少于2周
D.10天左右
E.4周左右
Because of the financial crisis, days are gone ________ local 5star hotels charged 6,000 yuan for
one night. [ ]
A. if
B. when
C. which
D. since
l crisis, days are gone ________ local 5star hotels charged 6,000 yuan for