甲亢患者既往有哮喘史，下列哪种药物不宜使用（）。

A.甲硫氧嘧啶

B.丙硫氧嘧啶

C.普萘洛尔

D.甲亢平

E.他巴唑

An on-load release system on a survival craft means the cable can be released（）.

A.only when the load is taken off the cable

B.only when there is a load on the cable

C.only when activated by the controls at the lowering station

D.at any time