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【判断题】
脂肪酸山梨坦与聚山梨酯类均为非离子型表面活性剂,均可单独制成乳剂型。A.
正确
B.
错误
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皮皮学刷刷变学霸
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【简答题】常见的跟踪定位设备有哪些?
【单选题】Your sister used to visit you quite often, ______?
A.
isn't she
B.
use not she
C.
wasn't she
D.
didn't she
【单选题】—Did your father _____ catch a cold? —No, he didn't. But he _____ the weather here. [ ]
A.
often, used to
B.
never, be used to
C.
often, was used to
【单选题】I a lot but I don't play very often now. [ ]
A.
use to play tennis
B.
was used to play tennis
C.
am used to play tennis
D.
used to play tennis
【简答题】计算机网络从距离上可以分成几类?
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