从事潜水作业的小船，在白天可以用国际信号（）旗的硬质复制品代替球、菱形、球号型？
A.Y
B.B
C.A
D.O
参考答案：C
— We must thank you for taking the trouble to cook us a meal.
— ____. [ ]
A. With pleasure
B. It doesn't matter
C. It was no trouble at all
D. By all means
患者凝血酶原时间(PT)延长，提示下列哪一组凝血因子缺陷
A．因子Ⅷ、Ⅸ、Ⅺ
B．因子ⅩⅢ、Ⅻ、Ⅺ
C．因子Ⅱ、Ⅴ、Ⅶ、Ⅹ
D．因子Ⅴ、Ⅶ、Ⅷ
E．因子Ⅴ、Ⅶ、Ⅻ
