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【单选题】
已知 = 0.005000g/mL ,测定Na 2 CO 3 试样消耗HCl标准溶液 20.00ml ,则被测试样 Na 2 CO 3 的质量为 :A.
0.01000
B.
0.1000
C.
0.02000
D.
0.2000
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举一反三
【单选题】5 bullhead rail / flat bottom rail B. A ____________________ has a foot and head that are roughly even.
A.
bullhead rail
B.
flat bottom rail
【单选题】5 bullhead rail / flat bottom rail A. A ________________________ has a wider foot and narrower head.
A.
bullhead rail /
B.
flat bottom rail
【单选题】The cost of the air fare is higher than ______.
A.
the rail fare
B.
that of the rail fare
C.
those of the rail fare
D.
which of the rail fare
【单选题】Large cities prefer light rail to 'heavy' rapid-rail systems because light rail requires less construction material.
A.
Y
B.
N
C.
NG
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