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【单选题】
照射量的国际单位是A.
C·kg -1
B.
kg·C -1
C.
A·kg -1
D.
kg·A -1
E.
J·kg -1
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皮皮学刷刷变学霸
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【单选题】It's known to us all that Shanghai is bigger than________ in China. [ ]
A.
any city
B.
any other city
C.
the other city
D.
any city else
【简答题】称取 CaC2O4 和 MgC2O4 纯混合试样 0.6240 g ,在 500 °C 下加热,定量转化为 CaCO3 和 MgCO3 后为 0.4830 g a 、计算试样中 CaC2O4 和 MgC2O4 的质量分数; b 、若在 900 °C 加热该混合物,定量转化为 和 MgO 的质量为多少克?
【单选题】The enemy took _____control of the city. In other words, all the city was under _____ control of the enemy.
A.
the; the
B.
the; /
C.
/; the
D.
a; the
【单选题】______ the highest building in the city at night, the city looks ever more magnificent with all its lights on.
A.
To be seen
B.
Seen from
C.
To see
D.
Seeing from
【简答题】称取 CaC 2 O 4 (M= 128.1) 和 MgC 2 O 4 (M=
112.3) 纯混合试样 0.6527g ,在 500°C 下加热,定量转化为 CaCO 3 (M= 100.0) 和 MgCO 3 (M= 84.31) 后为 0.5014g 。若在 900°C 加热该混合物,定量转化为 (M
= 56.08) 和 MgO (M
= 40.30) 的质量共多少克?
【单选题】Johnstown was the smallest city and the first city in the country to operate 'all electric' St. Louis cars.
A.
Y
B.
N
C.
NG
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