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【单选题】
已知TK2Cr2O7/Fe=0.005000g/ml,如果测定含铁供试品时消耗K2Cr2O7滴定液20.60ml,被测供试品中铁的质量约为( )。A.
0.01g
B.
0.1g
C.
0.2g
D.
0.02g
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举一反三
【单选题】_________ with the work,she sat down to have a break. [ ]
A.
To tire
B.
Tire
C.
Being tired
D.
Tired
【单选题】____ almost the whole time of mine, the work made me extremely tired.
A.
Occupying
B.
Occupied
C.
Being occupied
D.
To occupy
【单选题】______ tired, after a hard work, she fell into bed and went straight to sleep.
A.
Felt
B.
Feeling
C.
Being felt
D.
To feel
【单选题】Local residents tired hard to protect this ______ of elephants from being killed.
A.
crowd
B.
school'
C.
herd
D.
flock
【简答题】微波的频率范围？
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