题目内容

He has two houses near the lake, but he still (仍然) wants to buy a ____one there.

A. first
B. second
C. third
D. fourth

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—Look! The cloud is like a beautiful flower!—Yeah! But it a star .

A. was; on time
B. was; just now
C. was; right now
D. were; just now

—When were you born?—I was born on ____.

A. 1999, October 29th
B. October 29th,1999
C. 1999, 29th October
D. 29th, 1999, October

体积形状系数为。

A. Φs=S/d2
B. Φv=Vp/d3
C. Φs=S/ d2

Ø颗粒形状是指一个颗粒的或表面上各点所构成的,它是除粒度外颗粒的另一重要的几何特征.