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【简答题】
判别下列方程中哪是全微分方程，并求全微分方程的通解： (1)(xcosy+cosx)y'-ysinx+siny=0; (2)(1+e 2y )dx+2xe 2y dy=0
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皮皮学刷刷变学霸
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【简答题】会阴冲洗的病人应取的卧位是
【单选题】Much _____ said about the problem but nothing _____ been done so far .
A.
were，has
B.
is，has
C.
were，had
D.
had been，has
【简答题】So far, almost nothing has been done to ______ the number of vehicles.
【单选题】— How do you like the country life here so far? — ____________.
A.
There is nothing special.
B.
It looks like boring.
C.
It’s too far from the city.
D.
It’s quite different from what I expected.
【单选题】So far nothing ________ Tom.I want to know the reason ________ he hasn't written to me. [ ]
A.
heard from；why
B.
has been heard from；why
C.
was heard from；that
D.
has heard from；that
【单选题】So far we____nothing from him.
A.
have been heard
B.
did not hear
C.
have heard
D.
have not heard
【单选题】We can surely overcome these difficulties _,___ we are closely united.
A.
so far as
B.
so long as
C.
as soon as
D.
as well as
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