题目内容

听句子，选出含有短元音e /e/的单词Listen to the sentences and circle the words with short e sound /e/.I betDebwill get a red bed.

A. I
B. bet
C. Deb
D. will
E. get
F. red
G. bed

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听句子，选出含有短元音e /e/的单词Listen to the sentences and circle the words with short e sound /e/.Ned,the hen,has two legs.

A. Ned
B. the
C. hen
D. has
E. two
F. legs

二阶导数就是一阶导数的导数

A. 对
B. 错

乘积的导数等于导数的乘积。

A. 对
B. 错

可微当且仅当可导

A. 对
B. 错