我国《献血法》规定,提倡18~55周岁的健康公民自愿献血。
参考答案:对
He asked ______the work was done as it had been planned ______.
A.whether; yesterday
B.whether; the day before
C.that; yesterday
D.that; the day before
细粒土分类按()分类。
A.液塑限和塑性指
B.颗粒组成
C.有机质含量
D.土的矿物成分