小肠扭转早期有
A．持续性腹痛B．阵发性腹痛C．持续性腹痛，阵发性加重D．阵发性钻顶样腹痛E．转移性腹痛
参考答案：C
When and where to build the new factory _____. [ ]
A. is not decided
B. are not decided
C. has not decided
D. have not decided
如图所示为我国发射的“神州六号”载人飞船与“神州五号”飞船运行轨道示意图，两飞船相比，下列说法中正确的是
A．“神州六号”的线速度较小
B．“神州六号”的角速度较小
C．“神州六号”的周期较短
D．“神州六号”的加速度较小
