以下哪项不是气滞血瘀型痛经的主要证候：
A．经前小腹胀痛
B．拒按
C．得热则舒
D．经行不畅
E． * * 胀痛
参考答案：C
The mathematics problem was too difficult. ______ worked it out.[ ]
A. Many students
B. Few students
C. A few students
D. Some students
某施工企业购人一台施工机械，原价60000元，预计残值率3%，使用年限8年，按平均年限法计提折旧，该设备每年应计提的折旧额为()元。
A.5820
B.7275
C.6000
D.7500
