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【单选题】
函数 在点 处的两个一阶偏导数都存在,则它:A.
在 处一定连续
B.
在 处全微分一定存在
C.
一定存在
D.
以上都不一定
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反馈参考答案：
举一反三
【单选题】American Indians _________ about five percent of the U.S. Population. [ ]
A.
fill up
B.
bring up
C.
make up
D.
set up
【单选题】下列有关说法正确的是
A.
氨水稀释后，溶液中 的值减小
B.
0.1 mol·L － 1 Na 2 CO 3 溶液加蒸馏水稀释，CO 3 2- 的水解程度增大，溶液的pH减小
C.
电解精炼铜过程中，阳极质量的减少与阴极质量的增加一定相等
D.
298 K时，2H 2 S(g)＋SO 2 (g)=3S(s)＋2H 2 O(l)能自发进行，则其ΔH>0
【单选题】I’ll()the exchange rate and service charge and then type up the check for you.
A.
make up
B.
figure out
C.
carry out
【单选题】Only by telling the truth win the trust and support of your friends.
A.
you can
B.
can you
C.
you did
D.
did you
【单选题】. Our teacher has a __________ for thinking up ways _________ his speeches attractive.
A.
gift, of making
B.
gift, to making
C.
knowledge, of making
D.
knowledge, to make
【单选题】What is the best title for this passage?
A.
Friends: More like a Burden than a Support.
B.
A Life without Friends is Meaningless.
C.
Friends: When Less is More.
D.
Cut Off the Unwanted Friends.
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