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【单选题】
聚丙烯酰胺常作为( )用于提高气浮效果。A.
混凝剂
B.
浮选剂
C.
助凝剂
D.
抑制剂
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】依次填入下面句子中的正确的一项是（ ）老班长虽然瘦（ ）只剩皮包骨头，眼睛深深（ ）陷了下去，还一直用饱满（ ）情绪鼓励我们。
A.
的、地、得
B.
地、的、得
C.
得、地、的
D.
得、的、地
【单选题】The young boy usually eats what he wants ______ what he needs.
A.
because of
B.
instead of
C.
such as
【单选题】What does the student mean when he says this? A．He is not sure whether he needs help.###SX
A.
What does the student mean when he says this? A．He is not sure whether he needs help.
B.
He is not sure whether the librarian would help him.
C.
He hesitates to bother the librarian.
D.
He is not sure whether he can find the information he needs.
【单选题】从单证的用途来分,大致可以分为商业单据(商业发票、装箱单等)、货运单据(海运提单、空运单、托运单等)、保险单据和金融单据(汇票、支票和本票等)以及( )等。
A.
(A)海关发票
B.
(B)官方单据(原产地证书、海关发票、检验检疫证书等)
C.
(C)文件与凭证
D.
(D)其他服务
【单选题】从单证的用途来分,大致可以分为商业单据(商业发票、装箱单等)、货运单据(海运提单、空运单、托运单等)、保险单据和金融单据(汇票、支票和本票等)以及( )等。
A.
海关发票
B.
官方单据(原产地证书、海关发票、检验检疫证书等)
C.
文件与凭证
D.
其他服务
【单选题】What does the student mean when he says this?
A.
He is not sure whether he needs help.
B.
He is not sure whether the librarian would help him.
C.
He hesitates to bother the librarian.
D.
He is not sure whether he can find the information he needs.
【单选题】What ______to do if he needs the book?
A.
has he
B.
he has
C.
will he have
D.
he will have
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