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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】When stars like our Sun die, they bloat to become red giants and then eject gigantic clouds of gas and dust into space. Increasingly, however, scientists found themselves at a profound loss to explain...
A.
explain-the possible way of death of our Sun.
B.
show the two types of red giants.
C.
discuss on the way of red giants to become white dwarfs.
D.
explore the origin of life.
【单选题】粉煤灰需水量比试验，标准砂应为符合GB/T17671-1999规定的（）的中级砂。
A.
0.5mm-1.5mm
B.
1.0mm-1.5mm
C.
0.5mm-1.0mm
D.
1.0mm-2.0mm
【单选题】按"土工试验标准"，砂土相对密度试验时，（）不正确。（）
A.
最大干密度试验宜采用击实法
B.
最小于密度采用漏斗法和量筒法
C.
砂土体积最大值的测量误差不宜大于5mL
D.
最大干密度试样的制备宜分三次（层）完成