桥梁工程用石料抗压强度试验的标准试件,采用边长为( )的正立方体试件。
A.50mm
B.70.7mm
C.150mm
D.70mm
参考答案:D
The number of players in this year's sports meet was half ______. [ ]
A. last year's
B. that of last year's
C. of last year's
D. those of last year's
混响太长会使声音听起来单薄干涩。