Gene alterations may be caused by
查看答案
Which country has the first commercial power station that makes use of tidal currents？
A. China.
B. Norway.
C. England.
D. America.
The napkin is used only for
Compared to common electrical conductors, superconductors
A. have little or no electrical resistance.
B. can be used for a long time.
C. are not energy-efficient.
D. can be made easily.
A．complexB．basicC．seriousD．favorable
A. complex
B. basic
C. serious
D. favorable
微信支付 
支付宝支付