如果温度上升3 ℃记作+3 ℃,那么下降8 ℃记作( )
-8 ℃
The Sydney Opera House is like a huge sailing boat with water ____ three sides.
A.at
B.of
C.in
D.on
胶体溶液型液体药剂中分散相质点的大小为()
A.100~500nm
B.10~500nm
C.10~100nm
D.1~500nm
E.1~100nm