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【单选题】
下列物质中哪些可以用直接法配制标准溶液?A.
KMnO 4 ,
B.
KOH,
C.
H 2 SO 4 ,
D.
K 2 Cr 2 O 7 ,
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【简答题】吹塑薄膜法
【单选题】— I don’t know whether I should go abroad or not, Mum. — I leave _______ to your own judgment whether you should do it.
A.
that
B.
it
C.
this
D.
what
【单选题】I don’t know _____ or not he will come . _______ he comes , I will call you .
A.
whether ; If
B.
whether ; Whether
C.
if ; If
D.
if ; Whether
【单选题】He asked me ______.
A.
whether was I a football player
B.
was I a football player
C.
that whether I was a football player
D.
whether I was a football player
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