这个标志是何含义?()
A.事故多发路段
B.减速慢行
C.注意危险
D.拥堵路段
参考答案:C
Sometimes in summer, when ______ sun is rising, you can still see ______ clear moon hanging in the sky.
A.the, the
B.a, the
C.the, a
D.a, a
物体所含物质的______叫做质量.地球的质量是6.0×1024Kg,相当于______t.一枚大头针的质量约 8.0×10-5 Kg,合______mg.