You can indicate that your vessel is in distress by（）.

A.displaying a large red flag

B.displaying three black balls in a vertical line

C.sounding four or more short rapid blasts on the whistle

D.continuously sounding the fog whistle

能使甲状腺增大、充血的药物是（）

A.丙硫氧嘧啶

B.普萘洛尔

C.卢戈液

D.甲状腺素

E.氢化可的松