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【单选题】
称取含银废液 2.075g ,加入适量 HNO 3 ,以铁胺矾为指示剂,消耗了 25.50 mL 0.04634 mol·L - 1 的 NH 4 SCN 溶液,废液中银的质量分数为( )(已知: Ag 的摩尔分数为 107.9 )A.
0.06145
B.
0.1229
C.
0.03048
D.
0.2458
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【单选题】It was also apparent that the wagging dance, the bee moved sideways,sent another message.A．whichB．w
A.
It was also apparent that the wagging dance,____ the bee moved sideways,sent another message. A．which
B.
where
C.
that
D.
what
【单选题】Not only __________, but also he had been sent to prison.
A.
the poor man had been fined
B.
had the poor man been fined
C.
the poor man was fined
D.
had the poor man fined
【单选题】China sent up two manned spaceships and they were also great scientific _______ in the world.
A.
campaigns
B.
surprises
C.
achievements
D.
discoveries
【单选题】Not only the doctor but also these nurses ______sent to Wuhan.
A.
is
B.
was
C.
are
D.
have
【单选题】Not only the USA and Russia but also China ________ manned satellites to circle the earth.
A.
has sent up
B.
has been sent up
C.
have sent up
D.
have been sent up
【简答题】A“Booking Confirmation”will also be sent to _________________provided .
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