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【判断题】
定义变量的不能直接给它们赋初值。A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
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【单选题】用0.1mol·L -1 NaOH溶液滴定0.1mol·L -1 HAc(pKa=4.7)时的pH突跃范围为7.7~9.7,由此可以推断用0.1mol·L -1 NaOH溶液滴定pKa=3.7的0.1mol·L -1 某一元酸的pH突跃范围是( )
A.
6.7~8.7
B.
6.7~9.7
C.
6.7~10.7
D.
7.7~9.7
【单选题】—Did you feel cold last night? —Yes. So we made a ______ and sat around it. [ ]
A.
fire
B.
house
C.
cotton coat
D.
chimney
【简答题】A．Mr. Cotton calls British airlines. B．The July 12th plane is not available. C．Mr. Cotton chooses the economy class seat. D．Mr. Cotton likes the aisle seat.
【简答题】完成对话。 A: Good morning. 1. _________ B: I'd like to see some blouses, please. A: We have some cotton ones hanging here, and some silk ones over there. 2. _________ B: I'd like to look at the cotton one...
【单选题】Clothing made of man-made fibers has certain advantages over _____ made of natural fibers like cotton, wool or silk.
A.
the ones
B.
one
C.
that
D.
what
【单选题】She has bought herself ______ dress.
A.
a cotton purple expensive
B.
an expensive purple cotton
C.
a purple expensive cotton
D.
a cotton expensive purple
【单选题】用0.1 mol·L -1 NaOH滴定0.1 mol·L -1 HAc(P Ka= 4.7)时的pH突跃范围为7.7~9.7,由此可以推断用0.1 mol·L -1 NaOH滴定P Ka 为3.7的0.1 mol·L -1 某一元酸的pH突跃范围是 ( )
A.
6.7~8.7;
B.
6.7~9.7;
C.
6.7~10.7;
D.
7.7~9.7
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