滚装客船货物受力，就积载和系固而言，主要是（）影响较大。
A、纵向力；横向力
B、纵向力；垂向力
C、横向力；垂向力
参考答案：A
The book was written in 1946, ____ the education system has witnessed great changes. [ ]
A. when
B. during which
C. since then
D. since when
下列哪一项不是小儿脑肿瘤的特点（）
A.颅内压症状出现较早
B.呕吐是唯一早期症状
C.头痛在清晨较重，以额、枕部为主
D.肿瘤定位症状少、出现晚
E.好发在中线、前颅凹部位
