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【单选题】
What accident does the flying-car road sign imply?A.
A car flied headfirst into the sea and nobody caused death and damage.
B.
A car flied headfirst into the sea because the driver was stupid.
C.
A car is flying headfirst into the sea and will probably cause death and damage.
D.
A car is flying headfirst into the sea and will probably be safe.
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【单选题】下列化学反应中,属于氧化还原反应的是
A.
Na 2 CO 3 ＋2HCl==2NaCl＋H 2 O+CO 2 ↑
B.
AgNO 3 +NaCl=AgCl+NaNO 3
C.
Fe+CuSO 4 ===Cu+FeSO 4
D.
2NaOH+H 2 SO 4 =Na 2 SO 4 +2H 2 O
【简答题】下列化学反应中，属于氧化还原反应的是( )。
【单选题】下列化学反应中,属于氧化还原反应的是
A.
Na 2 CO 3 ＋ CaCl 2 ==CaCO 3 ↓ ＋ 2NaCl
B.
Fe ＋ CuSO 4 ==Cu ＋ FeSO 4
C.
2NaHCO 3 Na 2 CO 3 ＋ CO 2 ↑ ＋ H 2 O
D.
CaO ＋ H 2 O==Ca （ OH ） 2
【单选题】在严格选择供血员，排除HBsAg携带者情况下，仍引起输血后肝炎的病毒可能是( )
A.
柯萨奇病毒
B.
ECHO病毒
C.
甲型肝炎病毒
D.
HCV
E.
乙型肝炎病毒
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