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【单选题】
下列各对溶液中，哪些能用来配制缓冲溶液 ( )A.
NaOH 和NaCl
B.
HNO 3 和NaOH
C.
Na 3 PO 4 和HCl
D.
HCl 和NH 4 Cl
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举一反三
【单选题】When Pa was leaving, Ma was worried because ______.
A.
it might not be worth the effort going a long way to trade things
B.
the weather was not fine and the road was dangerous
C.
Pa might not be able to return before dark
D.
she and the girls would be without protection
【单选题】Many important officers were ______ in that case.
A.
included
B.
involved
C.
contained
D.
revolved
【单选题】As mentioned in the text, the Wednesday's hearing revolved around ______.
A.
the precise capabilities of spy satellites in orbit
B.
NASA's indecisions against checking upon the Columbia
C.
NASA's rejection of satellite images offered
D.
the coordination between NASA and military offices
【简答题】世界地图的投影主要考虑应保证全球 ,根据不同的要求,需要具有 ,或等积性质。
【简答题】A．pinpointed B．confined C．focused D．revolved
【单选题】In a telephone survey of more than 2, 000 adults, 21% said they believed the sun revolved(旋转)around the earth. An【C1】______7% did not know which revolved around【C2】______. I have no doubt that【C3】____...
A.
excessive
B.
extra
C.
additional
D.
added
【简答题】When children say sounds like “ba ba ba ba” “pa pa pa pa” “ma ma ma ma”, they undergo the stage of ____________.
【单选题】The earth ____ around the sun.
A.
revolved
B.
revolves
C.
is revolved
D.
was revolved
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