遗传性凝血功能障碍一般是单一凝血因子缺乏,出血症状发生于()
A.婴幼儿期
B.青春期
C.成年期
D.老年期
E.哺乳期
参考答案:A
After dinner, Mother asked Tom __________ his home work. [ ]
A. to go on
B. to get down to do
C. to get down to doing
D. to getting down to doing
某露天环境下工地采用直径d=150mm(小头)的杉木杆作混凝土梁底模立柱(有切削加工),柱高2.4m,两端铰支。试问该立柱能承受施工荷载(主要是活载)的轴压力(kN)与下列何项数值接近?()
A.109.0
B.130.9
C.145.4
D.209.9