【简答题】They_____ _______ cocoons. Now they ______ ___________.
【多选题】The cocoons will be boiled in hot water in order to __________.
C.
wash the cocoons completely
D.
melt the glue among the silks
【单选题】For what purpose should the cocoons be first steamed?
A.
To kill the pupae inside.
B.
To dissolve the sticky coating that binds the silk.
C.
To make sure the strands will not be twisted.
【判断题】在原电池中,电势高的极是正极,发生的是氧化反应。
【简答题】原电池中,电极电势高的是( ),电极电势低的是( )
【多选题】以PostScript为基础的文件类型包括()。
【简答题】Now they _____ moths. They____ __________cocoons.
【判断题】在原电池中, 电势高的一端为正极,发生还原反应。
【简答题】They are brown cocoons. ( 改成一般过去时 ) They ________ brown cocoons.