钢结构车体存在的最主要的问题是()。
A.强度低
B.焊接工作量大
C.腐蚀严重
D.维修成本高
参考答案:C
23.Robert made a call to his parents yesterday afternoon. To his disappointment, ____of them answered it.
A.either
B.both
C.none
D.Neither
传染性软疣最有效的治疗方法是()
A.无菌条件下用齿镊或弯钳夹破,挤出内容物
B.外用莫匹罗星软膏
C.手术治疗
D.激光治疗