可作为黏合剂使用和胃溶型薄膜包衣的辅料是（）

A．羟丙基甲基纤维素

B．硫酸钙

C．微晶纤维素

D．淀粉

E．糖粉

If a vessel takes a sudden severe list or trim from an unknown cause, you should first（）.

A.determine the cause before taking countermeasures

B.assume the shift is due to off-center loading

C.counterflood on the side opposite the list or trim

D.assume the cause is environment forces