The coals, oil and natural gases are called .
A、fossil fuels
B、newer fuels
C、newer energy
D、--
A、fossil fuels
B、newer fuels
C、newer energy
D、--
A、Gray rooftop tiles were typical of traditional hutong buildings.
B、Gray rooftop tiles made one think of the architectural tradition in the neighborhood.
C、无
D、无
A、Import substitution
B、Export promotion
C、Commercial dumping
D、Multilaterial contract
A、25%
B、50%
C、75%
D、--
A、1000 years ago
B、at present
C、in the future
D、--
A、hundreds
B、millions
C、thousands
D、--
A、ionic bonds
B、covalent bonds
C、intermolecular forces
D、--
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