哪一面不是枕大孔疝的常见症状
A．剧烈头痛，频繁呕吐
B．颈强
C．早期出现一侧瞳孔散大
D．意识障碍
E．呼吸骤停发生早
参考答案：C
将多项式2x3y-4y2+xy-5x2y3按照x的升幂排列______．
Thirty-five percent of the breaking strength of an anchor cable is generally accepted as the（）.
A.safe operating load
B.normal operating tension
C.emergency working load
D.allowable storm load
