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【判断题】
有机溶剂的极性系数是指某些溶剂在正辛烷与中的分配系数。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】完形填空。 A door was locked. A big stone came and hit the door. But he couldn't 1 it. Later a key came. He 2 the lock and the door opened. The stone was very 3 that the key could open it so easily. He ask...
【单选题】This big stone ________ at least a ton.
A.
weighs
B.
is weighed
C.
had we
D.
had been weighed
【单选题】This big stone ________ at least a ton.
A.
weighs
B.
is weighed
C.
had weighed
D.
had been weighed
【单选题】He fell and hit his forehead on the stone. That’s how he got this big ____.
A.
bulging
B.
protruding
C.
sticking
D.
swelling
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