()是稗草植株营养生长期的主要特征。
A、无叶舌
B、有叶舌
C、有毛
D、无叶柄
参考答案:A
灰土地基的质量检验标准对土颗粒粒径允许的偏差值是( )mm。
A.≤20
B.≤10
C.≤15
D.≤25
Having finished lunch, the case was discussed .
A.they discussed the case
B.they had discussed the case
C.the case was discussed
D.the case had been discussed