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【简答题】
灰体的反射率___。①反射率等于1;②反射率等于0;③介于0和1之间。
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反馈参考答案：
举一反三
【简答题】十六进制数 FFF.C 相当十进制数 ______ 。
【单选题】Three fourths of the surface of the earth ___ covered withwater.
A.
are
B.
is
C.
was
D.
were
【单选题】Three fourths of the surface of the earth ______ covered with water.
A.
are
B.
is
C.
will be
D.
was
【单选题】Three fourths of the ________ in the country have run out.
A.
water
B.
book
C.
forests
D.
news
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