A “bowline” is used to（）.

A.join lines of equal size

B.form a temporary eye (loop) at the end of a line

C.be a stopper

D.keep a line from fraying

下列属于栓剂水溶性基质的是

A．可可豆脂

B．聚乙二醇

C．硬脂酸丙二醇酯

D．半合成脂肪酸甘油酯

E．羊毛脂