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【单选题】
某缓冲溶液含有等浓度的HA和A - ,若A - 的 =1×10 -10 ,此缓冲溶液的pH是 ( )。A.
10.0
B.
4.0
C.
7.0
D.
14.0
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举一反三
【单选题】The food is good at this hotel, but the is poor the waiters don't seem to be well trained.
A.
service
B.
repair
C.
charge
D.
maintenance
【单选题】The food is good at this hotel,but the ____ is poor;the waiters don’t seem to be well trained.
A.
maintenance
B.
repair
C.
charge
D.
service
【单选题】The food is good at this hotel, but the_____is poor; the waiters don’t seen to be well trained.
A.
service
B.
repair
C.
charge
D.
maintenance
【单选题】The author suggests that language in ads should be understood ______.
A.
according to its dictionary definition
B.
according to its contexts
C.
imaginatively
D.
impartially
【单选题】The food is good at this hotel, but the ___ is poor; the waiters don't seem to be well trained.
A.
maintenace
B.
repair
C.
charge
D.
service
【单选题】According to the passage, which of the following can be found in the greatest number of different climate area on earth?
A.
Penguins.
B.
Camel
C.
Bears.
D.
Mosses.
【单选题】According to the passage, which of the following can be found in the greatest number of different climate areas on Earth?
A.
Reef corals
B.
Penguins
C.
Bears
D.
Camels
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